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Average force exerted on a baseball

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  1. Oct 17, 2015 #1
    1. Question
    A 0.145kg baseball moving horizontally at 35.0m/s strikes a bat and is popped straight up to a height of 55.6m before turning around. If the contact time is 0.50ms, calculate the average force on the ball during the contact.

    2. Relevant equations
    p=mv
    Δp=mΔv=fΔt
    Ek=0.5mv^2 (?)
    Ep=mgh (?)

    3. The attempt at a solution
    pinitial=(35)(.145)=5.075 kg*m/s

    I was going to use the time that was given, but I'm unsure if the "ms" unit was a typo or was written on purpose. If it was on purpose, I'm unsure how I should use it
     
  2. jcsd
  3. Oct 17, 2015 #2

    Orodruin

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    Why do you think it is a typo? What do you think "ms" means? Are you familiar with the SI prefixes?
     
  4. Oct 17, 2015 #3
    Ah, didn't realize that it meant milliseconds! First time I've ever seen that in Physics. Would that mean 0.50ms=0.5*10^-3s or 5*10^-4s?
     
  5. Oct 17, 2015 #4

    Orodruin

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    Yes.

    The SI prefixes may be used together with any unit in the SI system. It is a good lesson to take in.

    Edit: The caveat being the use together with the SI unit kg ...
     
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