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For this problem, five railroad cars each have a mass of 15,000 kg. Four connected...

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For this problem, five railroad cars each have a mass of 15,000 kg. Four connected railroadcars sit at rest on a track. The fifth car approaches them with a velocity of 20 m/s. The fifth car collides and couples with the other for cars.(a) What is the momentum of the fifthrcar before the collision?(b) What is the momentum of all the cars after the coupling?(c) What is the velocity of the five coupled cars after the collision?(d) What is the initial kinetic energy of the fifth before the collision?(e) What is the kinetic energy of all five cars just after the collision?(f) Is energy conserved in the collision?

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