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Freely falling bodies

  1. Sep 26, 2008 #1
    1. The problem statement, all variables and given/known data

    A ball is thrown straight upward and rises to a maximum height of 18 m above its launch point. At what height above its launch point has the speed of the ball decreased to one-half of its initial value?

    2. Relevant equations
    i dont know.

    3. The attempt at a solution
    vi=0, d=18m, g=9.81, this is all i know.
  2. jcsd
  3. Sep 26, 2008 #2


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