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Momentum of bouncing ball

  1. Dec 13, 2015 #1
    I've seen the solution to finding the velocity after a ball bounces off of a wall.
    http://www.lhup.edu/~dsimanek/ideas/bounce.htm

    If a ball of mass m1 and velocity v1 hit a massive wall, what is the final velocity. I understand the math. What I find a little confusing is reconciling the math and how the equation
    m1v1 = m1v2 + MV satisfies conservation of momentum if v1 = -v2 and V = 0.

    Is it that the massive wall of mass M moves will an infinitesimally small velocity such that MV balances the
    -2m1v2?
     
  2. jcsd
  3. Dec 14, 2015 #2

    Orodruin

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    Yes, you can see this by solving it for a finite M and then taking the limit as M goes to infinity.
     
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