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Work, Energy, and Power

  1. Sep 19, 2009 #1
    1. The problem statement, all variables and given/known data

    Just before striking the ground, a 200kg mass has 400J of KE. If friction can be ignored, from what heigh was it dropped

    2. Relevant equations

    KE = (1/2)mv^2
    PEg = mgh

    3. The attempt at a solution

    I drew a mass of 200kg and I drew the normal force at the top as well as the force of gravity (mg) at the bottom. My force of gravity = 9.81 and I know the KE = 400J I don't know what equation to use in order to find my height.
  2. jcsd
  3. Sep 19, 2009 #2


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