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Homework Help: Average force of a softball

  1. Feb 3, 2010 #1
    1. The problem statement, all variables and given/known data
    a 2 kg softball is pitched to u at 20 m/s. you hit the ball back along the same path, and at the same speed. IF the bat was in contact with the ball for 0.10 s, what is the magnitude of the average force the bat exerted?


    2. Relevant equations

    FAT=Pf-pi

    3. The attempt at a solution
    i found Pi and pf which are 40 and 40 respectively then i subctraed them and i get 0 which is also FAT..then i divided by 0.1 and i get 0...is is correct?
     
  2. jcsd
  3. Feb 3, 2010 #2

    rl.bhat

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    Homework Helper

    No. The momentum is a vector. So if Pi is positive, then Pf is negative. Now find the change in the momentum.
     
  4. Feb 3, 2010 #3
    i see..so now i get 80 and then i divded for 0,1 and i get 800 N
     
  5. Feb 4, 2010 #4

    rl.bhat

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    Homework Helper

    Yes.
     
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