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Finding the expression for momentum.

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  1. Apr 12, 2015 #1
    1. The problem statement, all variables and given/known data
    A bullet of mass m is fired into a block of mass M that is at rest. The block, with the bullet embedded, slides distance d across a horizontal surface. The coefficient of kinetic friction is μk.

    Find an expression for the bullet's speed vbullet.
    Express your answer in terms of the variables m, M, μk, d, and appropriate constants.


    2. Relevant equations
    p=mv

    After that I have nothing.
     
  2. jcsd
  3. Apr 13, 2015 #2

    ehild

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    Think a bit further. Why did you write p=mv? what are p, m, v?
     
  4. Apr 13, 2015 #3
    p= momentum
    m=mass
    v=velocity

    I also forgot to include:
    Faverage(Δt)=mΔv=Δp=J
     
  5. Apr 13, 2015 #4

    ehild

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    You have two objects, the bullet and the block. Both have momentums. What happens with the momentums when you fire a bullet into a block and the bullet is embedded in the block?
     
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