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Distance to get to home plate

  1. Sep 7, 2015 #1
    1. The problem statement, all variables and given/known data
    If Mariano throws a 92mph cut-fastball to David Ortiz and strikes him out, how long does it take for the pitch to get to home plate? Compare this to a 81 mph changeup and a 67mph knuckle ball.

    2. Relevant equations
    d= v1*t+1/2(a)(t^2)

    3. The attempt at a solution

    d=0*t+1/2(92)(t^2)
    d=0*t+46t^2
    d=t^3+46
    d/t^3=46
     
    Last edited by a moderator: Sep 7, 2015
  2. jcsd
  3. Sep 7, 2015 #2

    RUber

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    Mph indicates a speed (velocity) toward the plate. In you attempts, you have it in the acceleration place.
    Assume no air resistance and acceleration should be 0.
     
  4. Sep 7, 2015 #3

    RUber

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    Those last two steps are not allowed. You can't randomly combine terms Review your algebra.
     
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