A railroad car of mass M moving at a speed v1 collides and couples with two coup

Question

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? (Use M, v_1 for v1, and v_2 for v2 as appropriate.)
Click here to preview your answer._______________________ m/s

(b) How much kinetic energy is lost in the collision? Answer in terms of M, v1, and v2. (Use M, v_1 for v1, and v_2 for v2 as appropriate.)___________________________

Explanation / Answer

The velocity of coupled cars will be V1 after collision Kinetic energy lost=1/2Mv1^2+Mv^2

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