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Time it takes to lift boxes when man has an average useful power output of 41.4 W

by mphysicsdc
Tags: average, boxes, lift, output, power, takes, time
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Mar20-10, 07:00 PM
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1. The problem statement, all variables and given/known data
If a man has an average useful power output of 41.4 W, what minimum time would it take him to lift fifty 15.0-kg boxes to a height of 1.88 m?

2. Relevant equations
1/2mv(final)^2 mgy(final) = 1/2mv(initial)^2 mgy(initial)



3. The attempt at a solution

Dont even know where to start
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Mar20-10, 07:51 PM
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How much energy is needed to lift those boxes?

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