Tony has mass 75 kg coasts on his bicycle (of mass 10 kg) at a constant

Steve

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speed of 6 m/s, carrying an 8 kg pack.? Tony throws his pack
forward, in the direction of his motion, at
6 m/s relative to the speed of bicycle just
before the throw.
What is the momentum of the system im-
mediately after the pack is thrown?
 
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