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8. You push a 67-kg box across a floor where the coefficient of kinetic friction is 0.55. The force you exert is horizontal. (A) How

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8. You push a 67-kg box across a floor where the coefficient of kinetic friction is 0.55. The force you exert is horizontal. (A) How much power is needed to push the box at a constant speed of .5 m/$? (B) How much work do you do if you push the box for 35 seconds

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