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Q. A 20,000 kg railway car stands on a hill with its brakes set. The brakes are released, and the car rolls (without friction) down to the bottom of a hill 9m below its original position. It collides with a 10,000 kg railway car resting at the bottom of the track with its brakes off. The two cars couple together and roll up the track to a height of h. find out h.

Reference no: EM1388595

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