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Homework Help: Vertical leap equation

  1. Sep 19, 2005 #1
    the best rebounders in basketball have a vertical leap (that is, the vertical movement of a fixed point on their body) of 120cm.

    a) what is their initial "launch" speed off the ground?

    b) how long are they in the air?

    i don't want you guys to give me an answer. Can you guys point me in the right direction on how to solve these questions?
     
  2. jcsd
  3. Sep 20, 2005 #2
    Think about your equations of motion. What I do is write down the variables that I know, and the variable that I want to know, then find the equation that has all of those in it.
    So for this case you know that.
    x = 1.2m (displacement)
    a = -9.8m/s^2 (accelleration due to gravity)
    v = 0 (final velocity, this occurs when they are at maximum height)
    u = ? (initial velocity, what you need to find)
    So you need to find the equation that uses x, a, v, and u and solve it.
     
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