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A boy of mass 43.9 kg is initially on a skateboard of mass 2.00 kg, moving...

A boy of mass 43.9 kg is initially on a skateboard of mass 2.00 kg, moving at a speed of 10.3 m/s. The boy falls off the skateboard, and his center of mass moves forward at a speed of 11.1 m/s. Find the final velocity of the skateboard.

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