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Homework Help: Time it take to fall?

  1. Feb 13, 2008 #1
    If I'm given that someone releases a ball at x distance away from the ground how do you calculate how long it takes to fall?

    Another problem I have is finding the amount of time it takes to get to the top of an arc after you've thrown a ball and you're given the distance it is from the release to the top of the arc.

    Both these problems assume 9.8m/s^2 acceleration.
     
  2. jcsd
  3. Feb 13, 2008 #2

    mgb_phys

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    In your textbook there are three equations for the motion of objects.

    v = u + a t
    v^2 = u^2 + 2 a s
    s = ut + 1/2 a t^2

    Use the one with the variables you know.
    If you don't have a textbook there is a sticky thread at the top of this forum which describes all this very carefully.
     
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