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Homework Help: Speed after collision

  1. Sep 20, 2008 #1
    1. The problem statement, all variables and given/known data
    A bullet of mass m traveling horizontally at a very high speed v embeds itself in a block of mass M that is sitting at rest on a nearly frictionless surface. What is the speed of the block after the bullet embeds itself in the block?


    2. Relevant equations
    momentum=(mass)(velocity)


    3. The attempt at a solution
    momentum (p) of the bullet = mv.
    But I don't know how to figure out the speed of the block..since momentum is conserved, would it just be v=p/m?
     
  2. jcsd
  3. Sep 20, 2008 #2

    Doc Al

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    Staff: Mentor

    Momentum is conserved. What would be the momentum of the "block+bullet" after the collision? (Write it mathematically.)
     
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