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Coefficient of kinetic energy

  1. Mar 20, 2009 #1
    1. The problem statement, all variables and given/known data

    Consider a bullet of mass m fired at a speed of Vo into a wooden blcok of mass M. The bullet instantaneously comes to a rest in the block. The block with the embedded bullet slides along a horizontal surface with a coefficient of kinetic friction U.
    How far does the block slide before is comes to rest; find s.
    Express answer in terms of m,M,Vo,U and g.

    2. Relevant equations

    KE=PE

    3. The attempt at a solution

    1/2(m+M)V*V=(m+M)gs*U
    so
    s=V*V/2Ug

    I think that is correct , but now my answer does not have Vo,m,M?
    ("Express answer in terms of m,M,Vo,U and g.")
     
  2. jcsd
  3. Mar 20, 2009 #2

    tiny-tim

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    Science Advisor
    Homework Helper

    Hi anelmarx! :smile:

    Use conservation of momentum (it's conserved in all collisions) to find the velocity immediately after the collision. :wink:
     
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