What is the decrease in kinetic energy during the collision, Physics

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What is the decrease in kinetic energy during the collision

A railroad car of mass 2.00X10^4 kg moving at 3.00m/s collides and couples with two coupled railroad cars, each of teh same mass as the single cra and moving in the same direction at 1.20m/s a) what is teh speed of teh three coupled cars after the collision? b) what is the decrease in kinetic energy during the collision?

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Physics: What is the decrease in kinetic energy during the collision

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Physics: What is the decrease in kinetic energy during the collision

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