(Answered) A railroad car of mass 250 104 kg moving at 200 ms collides

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A railroad car of mass 2.50 104 kg moving at 2.00 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.

(a) What is the speed of the three coupled cars after the collision?

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