A railroad car with mass of 20000 kg moving at 3 ms, Ask an Expert

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A railroad car with mass of 20000 kg moving at 3 m/s collides and joins with two railroad cars already joined together, each with same mass as the single car and initially moving in the same direction at 1.20 m/s.

a) what is the speed of the three joined car after the collision?
b)What is decrease in kinetic energy during the collision?

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