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Homework Help: Friction, Spring Constant, Energy

  1. Feb 26, 2007 #1
    1. The problem statement, all variables and given/known data
    http://img339.imageshack.us/img339/4518/phys2lh6.gif [Broken]

    2. Relevant equations
    W= -um2gh
    Final Eq?:

    3. The attempt at a solution
    .2(4)9.8*(2*9.8(7+.2(4))/9 = 133.1754667
    I dont know if I went wrong in manipulating the equation but I suspect thats the issue?
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Feb 26, 2007 #2
    Sorry to bother you guys again but if I could please get some help tonight it would be much appreciated it must be turned in early tomorrow.
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