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Homework Help: Bullet into block of wood on table edge

  1. Oct 7, 2011 #1
    1. The problem statement, all variables and given/known data
    A 17 g bullet traveling 475 m/s strikes a 0.7 block of wood that is balanced on a table edge 0.7 m above ground. If the bullet buries itself in the block, find hte distance D at which the block hits the floor.


    2. Relevant equations
    Wnc = delta KE + delta PE?
    Law of conservation?

    3. The attempt at a solution

    Just have no idea really how to attack this problem, but im guessing it has to be broken into components somehow or something? just really confused on this one can someone get me started?
  2. jcsd
  3. Oct 7, 2011 #2


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    Start by using conservation of Momentum.
  4. Oct 7, 2011 #3


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    In problems like these you use the vertical component of the motion to work out how long [in time] it takes fro the block to reach the ground. You then use the horizontal component to find how far from the edge of the table it lands.
    As mentioned in previous post, use conservation of momentum To find initial velocity of block.
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