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A railroad car of mass M moving at a speed v1 collides and couples with two coupled railroad cars, each of the same mass M and moving in the same direction at a speed v2.
(a) What is the speed vf of the three coupled cars after the collision in terms of v1 and v2?
vf =
(b) How much kinetic energy is lost in the collision? Answer in terms of M, v1, and v2.
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