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Projectile Motion baseball Problem

  1. Jun 28, 2015 #1
    1. The problem statement, all variables and given/known data
    In the figure, a baseball is hit at a height h = 1.30 m and then caught at the same height. It travels alongside a wall, moving up past the top of the wall 1.1 s after it is hit and then down past the top of the wall 3.9 s later, at distance D = 42 m farther along the wall. (a) What horizontal distance is traveled by the ball from hit to catch? What are the (b) magnitude and (c) angle (relative to the horizontal) of the ball's velocity just after being hit? (d) How high is the wall?


    2. Relevant equations
    r(t)=r0+v0t+1/2 at2

    3. The attempt at a solution
    im having trouble finding v0 in the x direction im getting 15m/s=42m/2.8s

    Last edited: Jun 28, 2015
  2. jcsd
  3. Jun 28, 2015 #2


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    Your calculations already contain an error.

    The ball initially clears the top of the wall 1.1 s after it is hit, according to the problem statement. The ball then travels 42 m before it drops below the top of the wall, 3.9 s later.

    You have assumed that the ball drops below the top of the wall 3.9 s after it is hit, which I don't think is what the problem says happens. :wink:
  4. Jun 28, 2015 #3
    that should help. let me try this again. thanks
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