A train mass of 2000kg and speed 35 m/s collides and sticks to an identical train that is initially at rest .After the collision (a) what is the final speed of the entangled system? (b) what is the kinetitic energy of the system? compare the final kinetic energy to initial kinetic energy?
Answers: 2
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after the collision. 
(same amount) of kinetic energy would be lost. 
and its velocity 
. That is: 
.
.Since the other train wasn't moving before the collision, its initial momentum would be 
.
before the collision.
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.
.
.
.
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A train mass of 2000kg and speed 35 m/s collides and sticks to an identical train that is initially...
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