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Homework Help: Conservation of Momentum problem

  1. Mar 23, 2008 #1
    [SOLVED] Conservation of Momentum problem


    A tennis player receives a shot with the ball (0.0600 kg) traveling horizontally at 54.0 m/s and returns the shot with the ball traveling horizontally at 34.0 m/s in the opposite direction. (Assume the initial direction of the ball is in the -x direction.)



    3. The attempt at a solution
    I got part A by finding the change in initial and final momentum of the ball (5.28).

    I thought I could get part B by: mv = 5.28 so v = 88 m/s; and plug that into .5mv^2 to find the energy. That was wrong though and now I am not sure how to solve it.
  2. jcsd
  3. Mar 23, 2008 #2

    Doc Al

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    Staff: Mentor

    Find the change in kinetic energy.
  4. Mar 23, 2008 #3
    Ok thanks for the help. Makes sense.