Aboy on a 1.9 kg skateboard initially at rest tosses a(n) 7.8 kg jug of water in the forward direction. if the jug has a speed of 3.2 m/s relative to the ground and the boy and skateboard move in the opposite direction at 0.65 m/s, find the boy's mass. answer in units of kg.
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Definition: this is the weighted average of all of the isotopes of an element.
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Aboy on a 1.9 kg skateboard initially at rest tosses a(n) 7.8 kg jug of water in the forward directi...
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