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A single railroad car collides elastically with two other coupled cars, each of them of the...

A single railroad car collides elastically with two other coupled cars, each of them of the same mass as the single car. Just before collision, the single car is moving with a speed of 4.0 m/s and the coupled cars are stationary. After the elastic collision, the single car recoils back and the coupled cars take off in the opposite direction. If the coefficient of kinetic friction between the railroad cars and rail track is 0.15, how far will the coupled cars travel before they come to a stop?

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