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Homework Help: Just one example question

  1. Feb 14, 2006 #1
    i really need help with this- i partially understand it, but i'm not sure exactly how to do this problem.

    a 44 g bullet strikes and becomes embedded in a 1.54 kg block fo wood placed on a horizontal surface just in front of the gun. if the coefficient of friction between the block and surface is equal to .28 and the impact drives the block a distance of 18 m before it comes to rest, what was the muzzle speed of the bullet?

    can anyone help?
  2. jcsd
  3. Feb 14, 2006 #2
    use energy and momentum. what collison happens?
  4. Feb 14, 2006 #3
    i realize that impulse equals force times the change in time, which equals momentum, but i don't know how to apply these when there are two masses, and the coefficient of friction is involved. in all my previous problems, the necessary info was less and easier... :-\
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