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Homework Help: Baseball - (2D?) Kinematics - Projectile Motion

  1. Sep 20, 2009 #1
    1. The problem statement, all variables and given/known data

    A batter hits a baseball at a speed of 45 m/sec at an angle of 50° above the horizontal. The right fielder, who is standing 300 m away from the batter, begins to run when he sees the bat hit the ball. If the fielder runs at a constant speed, what speed does he need to run in order to catch the ball at a height of 1 m above the ground? Can he make it?

    P.S. The batter hits a grounder.

    2. Relevant equations

    Not sure. I think this one is used.

    Vfx = Vox + atx

    3. The attempt at a solution


    Please help if you can. I've honestly worked on this problem for at least two hours, but I don't understand it.
  2. jcsd
  3. Sep 21, 2009 #2
    I believe you have to use Xf=Xi+vt+0.5at^2 to solve
  4. Sep 21, 2009 #3
    I asked someone else, and he said that I should draw an accurate graph of this problem. But, I wasn't taught how to do this in class. I think my professor just used trigonometry or the equation you suggested, semc. I'm confused...
  5. Sep 21, 2009 #4
    I am not sure what your friend suggested about drawing a graph but i believe drawing the projectile might help. Firstly you have to know that this is a 2D question so the equation has a x and y component. Just resolve the initial velocity into the x and y component and use the equation and you should be able to get the answer.
  6. Sep 21, 2009 #5
    Thanks, semc. My homework assignment is due in a few minutes, so I can't type all that I wrote, but I calculated that the fielder must run 13.56 m/sec to catch the ball, which isn't possible.
  7. Oct 15, 2009 #6
    Does Usain Bolt play baseball? =D
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