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

  1. Mar 20, 2010 #1
    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
  2. jcsd
  3. Mar 20, 2010 #2


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    Homework Helper

    How much energy is needed to lift those boxes?
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