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Homework Help: Vertical throw initial height 15 time 3s until hiting ground

  1. Nov 1, 2016 #1
    1. The problem statement, all variables and given/known data
    Height - 15m
    Time when ball hits the ground after upward throw 3 s.

    I have been trying to find intitial speed with these formulas :

    Please help to understand how to find initial speed and after what time the ball is at 15m height again.
  2. jcsd
  3. Nov 1, 2016 #2


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    Science Advisor
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    Gold Member

    You need to post what you've done. Hint: what do you know about quadratic equations?
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