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Homework Help: Uniform acceleration

  1. Oct 7, 2012 #1
    1. The problem statement, all variables and given/known data
    Help please,I have no idea.....This is the last question of my hw

    A boy stands at the edge of a cliff which is 30m above the ground and throws a ball vertically upwards.It hits the ground 3.0s later.Find the initial velocity of the ball.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 7, 2012 #2


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    Homework Helper
    Gold Member

    Can you think of any kinematic (constant acceleration) equations that might apply?
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