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Homework Help: Initial velocity using angle, distance, time

  1. Mar 9, 2010 #1
    1. The problem statement, all variables and given/known data
    From the edge of a rooftop, a boy throws a stone at an angle of 25.0 degrees above the horizontal. the stone hits the ground 4.20 seconds later, 105 m away from the base of the building.(ignore air resistance). Find the initial velocity of the stone, the intial height from where the stone was launched, and the max hieght reached. I am stuck and cannot figure out which equation to use to find the inital velocity!

    2. Relevant equations
    no idea.

    3. The attempt at a solution
  2. jcsd
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