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A sumo wrestler (mass M) is at rest at the very end of a flatcar (mass 4M, length L) that is initially at rest.

A sumo wrestler (mass M) is at rest at the very end of a flatcar (mass 4M, length L) that is initially at rest. He then moves to the other end of the flatcar. How far does the flatcar move by the time the wrestler makes it to the other cnd?

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