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Homework Help: Collision/KE physics problem

  1. Oct 19, 2007 #1
    The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 12 g nail when it is struck by a 550 g hammer moving with an initial speed of 5.0 m/s.

    I thought I tried every combination of (1/2)(m+M)V^2 ... apparently except for the one I need. Any help on a step I am missing?
  2. jcsd
  3. Oct 19, 2007 #2


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    Homework Helper

    use conservation of momentum, as well as conservation of kinetic energy.

    show your steps.
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