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Homework Help: Momentum and energy problems

  1. Jan 2, 2010 #1
    Change in momentum of a ball

    Please note, instead of making a new thread I just edited my new question into this thread
    1. The problem statement, all variables and given/known data
    A ball is rolled into a wall and bounces back at the same speed, the change in momentum is?

    2. Relevant equations
    Ein = Eout
    3. The attempt at a solution
    I thought it was m(v) but I got it wrong (doing test corrections ATM)
    Last edited: Jan 2, 2010
  2. jcsd
  3. Jan 2, 2010 #2
    Conservation of energy.

    Where does that 100J go when the bow is pulled back and held in place? After the archer releases, where is the energy at the instant when the arrow leaves the bow, and how does that help you estimate its velocity at that instant?
  4. Jan 2, 2010 #3
    Oh, I get it, set Ep
    to Ek
    I was looking at W - P equations
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