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Homework Help: Kinetic energy of a Variable force

  1. Sep 24, 2008 #1
    1. The problem statement, all variables and given/known data
    The only force acting on a 4.0 kg body as it moves along the x axis varies as shown in the Figure. The velocity of the body at x = 0 is 6.6 m/s. What is the kinetic energy of the body at x = 6.9 m.

    Here's the chart:
    http://img135.imageshack.us/my.php?image=prob06av1at9.gif


    2. Relevant equations
    F=ma
    V{2}^2 = V{1}^2 + 2a{delta}x
    K=.5mv^2


    3. The attempt at a solution
    6 = 4a
    a = 1.5
    6.6^2 + 2* 1.5* 6.9= v{2}^2
    V{2}= 8.02 m/s

    K= .5*4*8.02^2
    K=128.52 J
     
  2. jcsd
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