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A train car of mass 3,366 kg sits at rest on the track. A second...

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A train car of mass 3,366 kg sits at rest on the track. A second car ofmass 3,161 kg moving at 4.2 m/s slams into it and they stick together.What is the combined speed of the train cars after the collision?Round your answer to the nearest 0.1. Do not add units.

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