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Homework Help: Deviation of a block

  1. Nov 28, 2009 #1
    First of all: Sorry about my English, but I am from France ;-)
    The problem:
    Somebody shoots into a block which is put up on two free running ropes and now you want to determine the velocity of the projectile by measuring the deviation of the block. I also have to consider gravity, which may protect the block from being deviated and the projectile gets stuck to the block, if this is important.
    I want to add that the mass of the projectile, the mass of the block and the length of the ropes are known.
    I am sorry that I can’t offer you an initial stage for a solution. The only thing I know is that the conservation of momentum may be a possible approach
  2. jcsd
  3. Nov 28, 2009 #2


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    Welcome to PF!

    Hi Gavroy! Welcome to PF! :smile:

    In questions like this, divide the motion into two stages, the collision and the swing …

    i] in the collision, momentum is conserved, so find the final velocity for the collision, wchi becomes the initial velocity for the swing

    ii] in the swing, (mechanical) energy is conserved :wink:
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