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Equation, algebra manipulation that I dont get? help!

  1. Dec 19, 2012 #1
    how does

    1/2kx2 = 1/2mv2 + 1/2kx2


    x = (m/k)v2 + x2 ??
  2. jcsd
  3. Dec 19, 2012 #2
    It doesn't. It becomes sqrt((m/k)v2 + x2)
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