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One Dimensional Motion help

  1. Aug 24, 2009 #1
    1. The problem statement, all variables and given/known data
    A baseball pticher throws a baseball with a speed of 44 m/s. Estimate the average acceleration of the ball drugin the trowing motion. It is observed that in throwing the baseball, the pitcher accelerates the ball through a dsiplacement of about 3.5 m, from behind the body to the point where it is released.


    2. Relevant equations

    V^2 = Vo^2 + 2a(X-Xo)

    3. The attempt at a solution
    I rearanged the equation above for a

    a = (2(X - Xo))^-1 (V^2 - Vo^2)
    I thought I did it correctly I pluged in the numbers

    a = (2(3.5 m))^-1 (44 s^-1 m)^2

    well i got the right units just got a crazy value of about 277 s^2 m

    i put this up here because it seemed kind of fast to me and I don't know were I went wrong...
     
  2. jcsd
  3. Aug 24, 2009 #2
    I ALSO HAVE ANOTHER QUESTION

    V^2 = Vo^2 + 2a(X-Xo)
    V = sqrt ( Vo^2 + 2a(X-Xo) )

    is that correct? the second line
     
  4. Aug 24, 2009 #3
    anybody?
     
  5. Aug 24, 2009 #4
    It looks correct. 44m/s is about 150km/h, so that's not such a crazy acceleration value since velocity is high.
     
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