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Potential Energy of a board

  1. Oct 19, 2009 #1
    1. The problem statement, all variables and given/known data
    A carpenter places a board weighing 22 lb on
    the edge of the roof 28 ft above the ground.
    How much potential energy does the board
    have in relation to the ground?
    Answer in units of ft · lb.


    2. Relevant equations
    PE=mgh


    3. The attempt at a solution
    I followed the formula 22*9.8*28 and i got 6036.8
     
  2. jcsd
  3. Oct 19, 2009 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    You are using 9.8 m/sec^2 for g. You have use 32.2 ft/sec^2 when you use units of feet and lbs.

    AM
     
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