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Homework Help: Collisions lab-bullet problem

  1. Oct 6, 2008 #1
    1. The problem statement, all variables and given/known data

    A 12g bullet is fired at 1600m/s into a wooden block of a ballistic pendulum, causing it to swing back, raising up 1.40m vertically. Find mass of the block

    2. Relevant equations


    3. The attempt at a solution

    bullet momentum= 12g*1600m/s=19.2kgm/s
  2. jcsd
  3. Oct 6, 2008 #2


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    Homework Helper

    Welcome to PF.

    What's happened to the kinetic energy of the bullet? Think maybe it got translated into the block?
  4. Oct 6, 2008 #3
    am i correct by saying that the block has a kinetic energy of____ due to the bullet

    ke= .5*.012kg*1600m/s^2
    = 15360kgm/s^2
  5. Oct 6, 2008 #4


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    Homework Helper

    Not quite. It's V2

    If it absorbed that much KE and the block and bullet was raised by 1.4m then ...
  6. Oct 6, 2008 #5
    do we assume that when the bullet collides with the block the block has the same velocity as the bullet?
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