Two 5000-kg freight cars roll toward one another (one at 1 m/s and the – McqOptions

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1.	Two 5000-kg freight cars roll toward one another (one at 1 m/s and the other at 2 m/s) on a level track. Thus before they collide one car's kinetic energy is 2500 J and the other's is 10,000 J. They collide and couple together. The amount of kinetic energy turned into heat (mostly warming the couplers) in the collision is ?
A.	1250 J
B.	2500 J
C.	7500 J
D.	11,250 J.
Answer» E.

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