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Force of bat on ball

  1. Oct 22, 2009 #1
    1. The problem statement, all variables and given/known data
    A 0.145 ball is pitched at 37 m/s and is hit on a horizontal line drive at 51.5 m/s. If the contact time between the ball and the bat is 3.5x10-3 seconds what is the avg force between the bat and the ball during contact.


    2. Relevant equations
    P=mv
    [tex]\Sigma[/tex]F=[tex]\Delta[/tex]P/[tex]\Delta[/tex]T

    mfinal*vfinal-minitial*vinitial/[tex]\Delta[/tex]Time

    factor out m (mass)
    m(vfinal-vinitial)/[tex]\Delta[/tex]t

    3. The attempt at a solution
    0.145kg(51.5m/s-37.0m/s)/(3.5*10-3)

    i get 600N but my webwork says that not right i have no idea what im doing wrong
     
  2. jcsd
  3. Oct 22, 2009 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    The change in velocity is 51.5 + 37.0 m/s. The ball is hit in the opposite direction to the pitch.

    Don't forget that force and momentum are vector quantities. The definition of force is:

    [tex]\vec F = \sum \vec F_i = \frac{d\vec p}{dt}[/tex]

    AM
     
    Last edited: Oct 22, 2009
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