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Mechanical Energy! Help

  1. Nov 7, 2005 #1
    Mechanical Energy! Help!!

    a 30 g bullet, with a horizontal velocity of 500m/s, comes to a stop 12 cm within a solid wall.
    (a)what is the change in it's mechanical energy?

    (b)what is the magnitude of the average force from the wall stopping it?

    * this is the first problem i've done like this so im not sure what to do.

    Vo(x) = 550m/s

    M = 0.03Kg

    Eq for change in mechanical Energy: E(mec) = K + U where..

    K = -0.5MVo^2 ?
    U = -W
  2. jcsd
  3. Nov 7, 2005 #2
  4. Nov 7, 2005 #3
    Can Anyone Help Me Out Here?
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