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Homework Help: Average force between baseball and bat

  1. Nov 14, 2014 #1
    1. The problem statement, all variables and given/known data

    A 0.145- kg baseball with an initial speed of 20 m/s rebounds with a speed of 36 m/s after being struck with a bat. If the duration of contact between ball and bat was 2.4 ms, what was the magnitude of the average force between ball and bat?

    2. Relevant equations
    Δ velocity=Vf-Vi
    F= mass* Δ velocity/(Δ time)

    3. The attempt at a solution

    Δ velocity = -36-20 = -56 m/s

    mass* Δ velocity/(Δ time) = 56 m/s * 0.145 kg / .0024s
    3383.333 N
  2. jcsd
  3. Nov 14, 2014 #2


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    Science Advisor
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    2017 Award

    Hello Rachel, and welcome to PF :)

    Seven digits precision is a bit much. Your calculation is just fine. Was that what you wanted to know ?
    (In fact PF isn't really meant for stamp-approving homework -- I hope I don't get in trouble over this one...)
  4. Nov 14, 2014 #3
    The problem is that it's an online hw and the website is saying it's incorrect. Thank you though!
  5. Nov 14, 2014 #4
    Actually, I decided to try it without any decimal points and it turned out to be right. Weird. Thanks again :)
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