Posted by **Fg** on Friday, April 1, 2011 at 4:49pm.

A boy on a 2.2kg skateboard initially at rest tosses a 7.9kg jug of water in the forward direction.

If the jug has a speed of 3.2m/s relative to the ground and the boy and skateboard move in the opposite direction at .56m/s, find the boy's mass.

Answer in units of kg.

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