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Simple work question

  1. Dec 3, 2005 #1
    Hey guys, my teacher asked us:

    A 55kg woman runs up a flight of stairs having a rise of 4.5m in 3.5s. What average power must she supply?

    I used the kinetic energy formula:

    1/2(55)((4.5/3.5)^2) = J
    Watts = J/3.5

    Is that the right approach? Because i cant get the answer in the back of the book :(
  2. jcsd
  3. Dec 3, 2005 #2
    use gpe instead of ke, because she is going up the stairs
  4. Dec 3, 2005 #3
    thanks a lot!
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