A railroad car of mass 21 104 kg moving at 350 ms collides, Physics

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A railroad car of mass 21 104 kg moving at 350 ms collides

A railroad car of mass 2.1 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. What is the speed of the three coupled cars after the collision? How much kinetic energy is lost in the collision?

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