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Physics

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A boy on a 2.4 kg skateboard initially at rest
tosses a(n) 8.2 kg jug of water in the forward
direction.
If the jug has a speed of 3.0 m/s relative to
the ground and the boy and skateboard move
in the opposite direction at 0.57 m/s, find the
boy’s mass.
Answer in units of kg

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