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Find Work Done

  1. Apr 11, 2012 #1
    A person with mass 55kg walks at a constant speed up a set of stairs with 20 steps, each 20 cm high.


    I have to find the work load.
    Formula: W=FxD where F is force and D is displacement.

    The book says my answer should be 2.2x10^3. OR 2,200 Joules.

    I really don't know how to do this. Please help me :)
     
  2. jcsd
  3. Apr 11, 2012 #2

    PeterO

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    20 steps each 20cm high totals 4m.
    How much work is done raising a 55 kg mass through 4 m. That could be a good start.
    I wonder whether you are supposed to take the value of g as 9.81, just 9.8 or perhaps even a round 10.
     
  4. Apr 11, 2012 #3
    9.8 is probably fine, considering the answer and all the values given only have two sig figs.
     
  5. Apr 11, 2012 #4

    PeterO

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    If you want to get 2.2 x 103N that would be fine, but if you want to get 2200 it is not. My statement was a hint rather than a puzzle to me.
     
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