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Homework Help: Linear momentum baseball pitch

  1. Dec 10, 2008 #1
    1. The problem statement, all variables and given/known data
    A 150-g baseball pitched at a speed of 40 m/s is hit straight back to the pitches at a speed of 60 m/s. If the bat is in contact with the baseball for 5 ms calculate the magnitude of the average force exerted by the bat on the baseball.

    2. Relevant equations
    Favg = delta p/ delta t

    3. The attempt at a solution
    delta p = m (Vf-Vi) = 0.150(60-40) = 3
    Favg = 3/0.005 = 3

    however the answer is 3000N, can anyone clarify where I made the mistake?
  2. jcsd
  3. Dec 10, 2008 #2


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    Homework Helper

    One of the values you have put in for the velocities is not correct. Remember that you have to account for the direction of the ball with the appropriate sign.
  4. Dec 10, 2008 #3
    oh thanks for pointing that out, it should be 60-(-40)
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