You'll get a detailed solution from a subject matter expert that helps you learn core concepts. What is the speed of the three cars after the collision? It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.00 m/s. Concept -, A: massofeachrailroadcar(m)=500000kginitialspeedoffirstrailroadcar=uinitialspeedof, A: Given It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.00 m/s. A 3.0 kg ball at 3 m/s and strikes a 1.5 kg ball moving at -2 m/s. Please give your answer in units of m/s, however, do not explicitly include units when . {/eq}. If the cars lock together as a result of the collision, A railroad car of mass 2.53 x 10^{4} kg is moving with a speed of 3.94 m/s. (a) 0 (b) 40 kg m/s (c) 40 kg m/s (d) 30 kg m/s (e) 10 kg m/s. At the . M2 = 95 kg, v2 = 6.2 m/s Mass, A: Given , inelastic collision with following information, A: Given:- (hint: figure kg, then convert answer, M = p/v = .140/4 = .035kg conversion:.035 X 1000 = 35grams, 5. 3. same as 1, if they stick together, final momentum (85+125)V solve for v. You can ask a new question or browse more Physics ~ CONSERVATION OF MOMENTUM ~ questions. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same dire, A railroad car of mass 24,300 kg is moving with a speed of 4.17 m/s. Tripadvisor performs checks on reviews. 2. just do the math. by the golf-club Round your answer to1 decimal If the cars lock together and move at the same speed 12.0 m/s as a result of the collision, how much of the initial kinetic energy is transformed to thermal or other forms of energy? If the cars lock together as a result of the . External forces can do work (work is force multiplied by distance), which can change the kinetic energy of objects, altering momentum. Also, from Newton's third law to every, A: Given data Express your answer with the appropriate u, A locomotive of mass 6.00*10^4 kg is moving eastward with a speed of 10.8 km/h. What is their final speed? A 12784 kg freight train, coasting at 17 m/s, strikes a stationary 5450 kg box car. Mass of first cart (m1) = 5 kg The two cars latch together during the collision and then move off to the ri, A 5000 kg freight car moving a 2m/s runs into a 10,000 kg freight car at rest. a) What i, A railroad car of mass 2.44 x 104 kg is moving with a speed of 4.10 m/s. A railroad car with a mass of 12,000 kg collides and couples with a second car of mass 18,000 kg that is initially at rest. Tours Add a Place Travel Forum Airlines Travel Guides Road Trips Help Center. (d) Solve the momentum equation for vf. What is their common speed just afterwards if (a) mB = 3mA, (b) mB is much larger than mA (mB>>mA), and (c) mA>>mB? Since velocity is. He grabs her around the waist, and they maintain their balance. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same dir. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. What is their final speed? asked by Faoruk February 27, 2018 2 answers Given: M1 = 10,000 kg, V1 = 10 m/s. All cars have a mass of mass 1.08 times 10^5 kg. Stargard Gate, located to the south of Neubrandenburg's Marienkirche , was first of the four medieval city gates that we have seen during our short stay within the old, medieval city walls. (f) Why are the answers to parts (d) and (e) different? Sand from a stationary hopper falls onto a moving conveyor belt at the rate of 5.00 kg/s as shown in Figure P9.52. $20,000/0.02 3. What is their speed, A railroad car of mass m = 38000 kg moving at v1 = 3.9 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at v2 = 2.184 m/s. Experts are tested by Chegg as specialists in their subject area. The two cars interlock and move off at what speed? (a) The red ball travels to the left with speed v, while the blue ball travels to the right with speed 3v. How much kinetic energy is lost in the collision? \left( 12000\ \text{kg} \right)\left( 2\ \text{m/s} \right)+\left( 10000\ \text{kg} \right)\left( 0\ \text{m/s} \right) &=\left( \left( 12000\ \text{kg} \right)+\left( 10000\ \text{kg} \right) \right){{v}_{f}} \\ Each railroad car has a mass of 75000 kg. Two openings in the city walls on the both sides of the Stargard Gate were made in 1909 in order to facilitate pedestrian traffic. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same dir, A railroad car of mass 2.52x10^4kg is moving with a speed of 4.18m/s. (a) Find the final speeds of the two particles in terms of vi. Determine the following. The cars stick together. Momentum before = Momentum after. A 5-kg cart moving to the right with a speed of 6 m/s collides with a concrete wall and rebounds with a speed of 2 m/s. A 14000 \ kg boxcar is coasting at 1.50 \ m/d along a horizontal track when it hits and couples with a stationary 10000 \ kg boxcar. 2. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same dire, A railroad car of mass 25,600 kg is moving with a speed of 3.82 m/s. A). V' is the final velocity after collision. A railroad car of mass 25,800 kg is moving with a speed of 4.18 m/s. UB= -7 m/s = intial velocity of B child and wagon is 22kg and the velocity is 1.5m/s? (a) What is the speed of the three coupled cars after t, A railroad car of mass 2.00 times 10^4 kg moving at 3.00 m / s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m / s. (a) What is the speed of the three coupled cars a, A railroad car of mass 2.1 \times 10^4kg moving at 4.00 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20m/s. If the cars lock together as a result of the collision, what is their common speed afterward? A 20,000 kg railroad car is traveling at 5 m/s when it collides and couples with a second, identical car at rest. 47.57 m/s b. here, the mass of each rail road car , m = 10,000 . A railroad car of mass 3.2 times 10^4 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. A 85 kg running back is moving at +12 m/s and strikes a 125 kg linebacker moving at -8.0 m/s. 25.67 m/s c. 27.0, Railroad cars are moved around in a switchyard. What is the speed of the three coupled cars after the collisio. Find (a) the sands rate of change of momentum in the horizontal direction, (b) the force of friction exerted by the belt on the sand, (c) the external force Fext, (d) the work done by Fext in 1 s, and (e) the kinetic energy acquired by the falling sand each second due to the change in its horizontal motion. (b) The red ball travels to the left with speed v, while the blue ball continues to move to the left with a speed 2v. An airplane flying acroos the sky. a) W, A railroad car of mass 3.5 x 10^4 kg moving at 4.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. The mass of, A: Letm1 be the mass of the cart which is moving. A, A railroad car of mass 15000 kg and velocity 5 m/s collides completely inelastically with a stationary railroad car of mass 25000 kg and couples to it. (e) Substitute values, obtaining the numerical value for vf, their speed after the collision. Consider a 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car initially at rest. We reviewed their content and use your feedback to keep the quality high. If the cars lock together as a result of the . What is the change in momentum of the cart? Createyouraccount. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same dir, A railroad car of mass 24,300 kg, is moving with a speed of 3.97 m/s. Here, m1 and m2 are the mass of the cars and u1 and u2 are their respective, A: The given data are: A 10,000 kg railroad car traveling at a speed of 24.0 m / s strikes an identical car at rest. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same di, A railroad car of mass 2.7 x 10^4 kg moving at 4.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. What is their final speed? A 10,000 kg railroad car traveling at a speed of 24.0 m/s strikes an identical car at rest. Assume the skateboarders undergo a completely elastic head-on collision on the horizontal segment of the half-pipe. Start your trial now! A 40,000-kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000-kg railroad car initially at rest, and the cars stick together. Places to see, ways to wander, and signature experiences. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.10 m/s. Mass of 2nd cart (m2 ) = 7.541 kg If the two vehicles lock together, what is their combined velocity immediately after the collision? 0.02($20,000)+ 0.02 4. They are released from rest simultaneously and collide in the trough of the track. A school bus traveling at 40 km/hr. This is not a violation of the conservation of energy as in most real life cases, systems of colliding objects cannot be isolated entirely from the environment. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same, A railroad car of mass 2.48 x 10^4 kg is moving at a speed of 3.84 m/s. a. (a) What is the speed of the three coupled cars after th, A railroad car of mass 2.10 times 10^{4} kg moving at 3.10 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/, A railroad car of mass 2.48 x 10^4 kg is moving at a speed of 3.84 m/s. F t = m v A railroad car moving at a speed of 3.16 m/s overtakes, collides and couples with two coupled railroad cars moving in the same direction at 1.40 m/s. 6. Stargarder Tor (Neubrandenburg) - All You Need to Know BEFORE You Go. A 12,000kg. 0.02($20,000)+ $20,000 5. We know that because of the principle of momentum conservation, the total momentum of the two railroad cars will not change. V2 = ? It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same d, A railroad car of mass 2.50 x 10^4 kg is moving with a speed of 3.87 m/s. The combined o speed of the car is 3.6m/sec Mass of first particle (m1) = 3.00 kg (a) What is the speed of the three coupled cars after the c, A railroad car of mass 3.00 x 10^4 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. Additionally, front gate is decorated with rosettes, gables and pinnacles, meanwhile, main gate's southern faade is decorated with nine figures of unclear meaning. Only knights in full armour and motley crowd of merchants, peasants, squires, craftsmen and monks was missing. The collision takes 0.15 s and after the crash the cars wheels lock and they skid to a stop on the u=0.40 road. a) What i. The cars stick together. A 10,000 kg railroad car traveling north at 10 m/s collides with a 5,000 kg rail car also moving north but at an unknown speed. Learn the concepts of inelastic collision and elastic collision. 1. A 10000 kg railroad car, A, traveling at a speed of 24.0 m/s, strikes an identical car, B, at rest. t is time period and m v is an impulse, A: Given:- What is, A railroad car of mass 2.50 x10^4 kg is moving at a speed of 4.00 m/s. It collides and couples with three other coupled railroads cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.00 m/s. Determine the following. A 2500 kg truck runs into the rear of a 1000 kg car that was stationary. They connect and move forward. If the cars lock together as a result of the collision, what is their common speed (in m/s) afterward? The Stargarder Tor is in fact a combination of two gates in the northern part of the old city wall of Neubrandenburg. A head-on, elastic collision occurs between two billiard balls of equal mass. A 1424-kg railroad car traveling at a speed of 11 m per s strikes an identical car at rest. The initial speed of cart A is,uA=1.5m/s A railroad car (m = 3000 kg) is coasting along a level track with an initial speed of 22 m/s. This number is based on the percentage of all Tripadvisor reviews for this product that have a bubble rating of 4 or higher. Start your trial now! A 5,000 kg open train car is rolling on frictionless rails at 22 m/s when it starts pouring rain. Q: by an 89-kg linebacker traveling with an initial speed of 5.2 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same, A railroad car of mass 2.49 x 10^4 kg is moving with a speed of 3.98 m/s. Rain falls vertically. A: The given system is closed which means there is no external force is acting on the system. other forms of energy? Mass(Ma)=2.42g If the cars lock together, what is the final speed of the two railroad. The two cars latch together during the collision and then move off to the ri, A 5100 kg open train car is rolling on frictionless rails at 17 m/s when it starts pouring rain. Apply the law of conservation of momentum to this problem A car with a mass of 1200 kg and a speed of 12 m/s heading north approaches am intersection. FIGURE P11.40 Problems 40 and 41. \\ Part A: Find the velocity of the heavier car after the collision. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.02 m/s. A car of mass 10,000 kg and speed of 10 m/s is coming onto a track where another set of coupled cars of total mass 50,000 kg is sitting at rest. What is their speed after the collision? A: Given, It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same dire, A railroad car of mass 25,600 kg is moving with a speed of 3.82 m/s. A 10,000-kg railroad car travels down the track at 30 m/s and hits a second stationary railroad car of 20,000 kg. The product of the mass with the velocity of the object is known as the momentum of the, A: Givendata: A 40,000 kg railroad car initially traveling at 10 m per s collides inelastically with a 20,000 kg railroad car initially at rest. A railway car having a total mass of 5.8 \times 10^5 kg, moving with a speed of 9.1 km/h, strikes another car that has a mass of 8.7 \times 10^5 kg and is initially at rest. (a), A railroad car of mass 2.46 \times 10^4 kg, is moving with a speed of 4.11 m/s. The cars stick together. move at the same speed 12.0 m/s as a result of the collision, how They are released from rest simultaneously and collide elastically in the trough of the track. . So, it was interesting to visit it again. With what velocity will the block and bullet move after the collision? It makes a rear-end collision with a stationary car whose mass is 1800 \ kg. This is the version of our website addressed to speakers of English in the United States. The golf-club was in contact with the ball for 3.5 x The first car is moving with a speed of 9 m/s prior to the collision. Liabilities and Stockholders Equity Accounts payable 29,000 15,000. What is the velocity of the vehicle? A railroad car of a mass of 24,000 kg is moving with a speed of 4.03 m/s. They collide, the lighter car rebounding opposite its original direction at 0.300 m/s. (a) What is the speed of the two cars after collision? {{\left( \text{Initial}\ \text{Momentum} \right)}_{\text{First}}}+{{\left( \text{Initial}\ \text{Momentum} \right)}_{\text{Second}}} &={{\left( \text{Final}\ \text{Momentum} \right)}_{\text{Both}\ \text{Cars}}} \\ Mass of, A: Given data: After the collision, the 1.5 kg ball moves to the right at 2 m/s. The cars lock together as a result of the collision. Initial velocity of, A: Impulse is given by Amazing place. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the sa. {/eq}, The second railroad car is at rest, so its velocity is {eq}{{v}_{2}}=0\ \text{m/s} 4. A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for, A: BounayrubberballP=m(-v-v)=-2mvClay:P=,(-o-u_=, A: Given: Near Train Stations. A 500 kg truck moving at 30 m/s strikes a parked 300 kg car. A initial velocity of the linebacker is, A: Given data A railroad car of mass 2.80 \times 10^4\ kg moving at 2.90 m collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. A: Given:uR=300m/s(Initialvelocityofrocket)dmgdt=5kg/s(Rateof, A: Given data: As an object increases speed, its momentum increases and as it decreases speed, its momentum decreases. A railroad car of mass 12,000kg collides and couple with the second car of mass 18,000kg that is initially a rest. If m2 = 4 m1 and the collision is elastic, find an expression for the velocity of each ball immediately after the collision. Learn about the linear momentum formula and how linear momentum relates to Newton's second law, plus see linear momentum examples. Mass of cart B mB= 1.50 kg What fraction of the initial kinetic energy still retained by the cars after the collision? The cars stick together. M1*V1 + M2*V2 = M1*V3 + M2*V3. {{m}_{1}}{{v}_{1}}+{{m}_{2}}{{v}_{2}} &=\left( {{m}_{1}}+{{m}_{2}} \right){{v}_{f}} \\ A railroad car of mass 2.50 x10^4 kg moving at 4.00 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.05 m/s. (a), A railroad car of mass 2.7\times 10^4 kg moving at 3.50 m per s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m. A railroad car of mass 2.50 x10^4 kg moving at 4.00 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. railroad car is traveling at 2m/s when it strikes another 10,000kg.railroad, car that is at rest. i.e if I have a problem A 12,000 kg railroad car traveling at a speed of 19 m/s strikes an identical car at rest. Initially, ball 1 rests on an incline of height h, and ball 2 rests on an incline of height h/2 as shown in Figure P11.40. The cars lock bumpers and skid off together with the wheels locked. 1. the final momentum is (M1+M2)V what is the recoil speed of the gun? (a) W, A railroad car moving at a speed of 3.04 m/s overtakes, collides, and couples with two coupled railroad cars moving in the same direction at 1.44 m/s. a) What is the velocity of the two cars just. The mass of object 1 is given as m1 = 7 kg. {/eq}, The mass of the second railroad car is {eq}{{m}_{2}}=10000\ \text{kg} See Answer What is the speed of the two cars after coupling? A proton traveling with speed 8.2 x 105 m/s collides elastically with a stationary proton in a hydrogen target. Mass of first car (m1) = 2000 kg What is the momentum of a childand wagon if the total mass of the. 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What is the speed of the three coupled cars after the collisio, A railroad car of mass 2.59104 kg is moving with a speed of 4.16 m/s. Chap. (f) Why are the answers to parts (d) and (e) different? What is the final velocity of 3.0 kg ball? C. A car traveling next to you at a. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same dir, A railroad car of mass 2.10 times 10^{4} kg moving at 3.10 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/. What is their final speed? Mass of cart A mA= 0.500 kg A mix of the charming, modern, and tried and true. Get access to this video and our entire Q&A library, Linear Momentum: Definition, Equation, and Examples, Railroad cars are moved around in a switchyard. (a) What is the initial momentum of the first car? A 9300-kg railroad car traveling at a velocity of 15 m/s strikes a second boxcar at rest. A 9,000 kg railroad car moving at 3 m/s strikes a stationary 5,000 kg railroad car. The cars become coupled and continue traveling. The cars lock together as they skid on the ice. If you are a resident of another country or region, please select the appropriate version of Tripadvisor for your country or region in the drop-down menu. A 9,300 kg. (c) Write the general equation for conservation of momentum in terms of m1, v1, m2, v2, and final velocity vf. Seven coupled railroad car moving with a speed of 3.7 m/s collide and couples with eight other coupled railroad cars moving in the same direction, Two railroad freight cars with masses 130 kg and 140 kg approach with equal speeds of 0.320 m/s. FIGURE P10.30. A 10,000-kg railroad car, A, traveling at a speed of 24.0 m/s strikes an identical car, B, at rest. a) What i, A railroad car of mass 2.41 x 104 kg is moving with a speed of 3.90 m/s. A 10,000-kg railroad car A, traveling at a speed of 24.0 m/s Stargard Gate, located to the south of Neubrandenburg's Marienkirche , was first of the four medieval city gates that we have seen during our short stay within the old, medieval city walls. Sign in|Recent Site Activity|Report Abuse|Print Page|Powered By Google Sites. A 1 kg toy train car traveling at 10 km/hr hits a stationary 750 gram toy train car. A 14,000 kg boxcar is coasting at 1.50 m/s along a horizontal track when it hits and attaches to a stationary 10,000 kg boxcar. (a) What is the initial momentum of the first car? It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same dire, A railroad car of mass 2.45x10^4kg is moving with a speed of 4.14m/s. This problem has been solved! Initial velocity of first cart (v1) = 2.0 m/s, to the, A: Elastic collision is a type of collision where both the momentum and the kinetic energy of the, A: Given Data: What is the magnitude of the kinetic energy (in J). A 10,000 kg railroad car traveling at a speed of 24.0 m/s strikes an identical car at rest. A railroad car moving at a speed of 3.16 m/s overtakes, collides and couples with two coupled railroad cars moving in the same direction at 1.40 m/s. One was initially moving at 2.2 m/s , and the other was at rest. They link together. uA= 4 m/s = initial velocity of A {/eq}. The conveyor belt is supported by frictionless rollers and moves at a constant speed of v = 0.750 m/s under the action of a constant horizontal external force Fext supplied by the motor that drives the belt. (a) Speed of the three coupled. What is the speed of the cars after the collision? After the collision, the cars lock together and slide. The mass of the second, A: Given data: Treating the skateboarders as particles and assuming they dont fall off their skateboards, what is the height reached by each skateboarder after the collision? A railroad car with a mass of 12,000 kg collides and couples with a second car of mass 18,000 kg that is initially at rest. P1i = 10 kg.m/s A railroad car of mass 2.55 times 10^4 kg is moving with a speed of 3.94 m / s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 1.97 m / s. A railroad car of mass 2.46 \times 10^4 kg, is moving with a speed of 4.11 m/s. (b) If, Use g=9.8 m/s2 a 980,000 J b 420,500 J c 98,000 Nm d 14,500 J, is 1000 000 less than 2 183 486 is 1 000 000 more than 746 000 is 1 000 000 less than 624 327 207, 2. a. Wha, A railroad car with a mass of 12,400 kg collides and couples with a second car of mass 18,700 kg that is initially at rest. After the collision, the two cars lock together and move north at 8 m/s. Our experts can answer your tough homework and study questions. First week only $4.99! A 14,000 kg boxcar is coasting at 1.5 m/s along a horizontal track when it hits and attaches to a stationary 10,000 kg boxcar. What is linear momentum? Impulse=p=mvf-vi=0.427kg22.6m/s--16.0m/s=16.48kgm/s, A: Answer: (A) {/eq}. No questions have been asked about this experience, Historic Sites Points of Interest & Landmarks, Points of Interest & Landmarks Architectural Buildings, Art Galleries Points of Interest & Landmarks, Points of Interest & Landmarks Historic Walking Areas, Stargarder Tor, Neubrandenburg: Address, Stargarder Tor Reviews: 4.5/5. A railroad car of mass 2.15 * 10^4 \ kg moving at 3.15 \ m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 \ m/s, A railroad car of mass 3.20 x 10^4 kg moving at 2.95 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. A railroad car of mass 2.50 x10^4 kg is moving at a speed of 4.00 m/s. The cars stick together. A 2400 kg vehicle travelling north at 10.0 m / s collides with a 500 kg vehicle that is travelling east at 20.0 m / s if the 2 vehicles lock together, what is their speed just after the collision? If the cars lock together as a result of the collision, what is their common speed just afterward? 2.) Consider a 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car initially at rest. Thus, we can equate the initial and final momentum sums to each other: {eq}\begin{align} What is their common speed just afterward? It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.10 m/s. The cars stick together. (b) If, A. (a) W, A railroad car of mass 2.50 times 10^4 kg is moving with a speed of 4.00 m/s. This number is based on the percentage of all Tripadvisor reviews for this product that have a bubble rating of 4 or higher. (a). It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the sa, A railroad car of mass 2.53 x 10^{4} kg is moving with a speed of 3.94 m/s.