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Freely Falling Bodies

  1. Dec 5, 2013 #1
    1. The problem statement, all variables and given/known data
    A small rock is thrown vertically upward with a speed of
    from the edge of the roof of a 30.0-m-tall building. The
    rock doesn’t hit the building on its way back down and lands in the
    street below. Air resistance can be neglected. (a) What is the speed
    of the rock just before it hits the street? (b) How much time elapses
    from when the rock is thrown until it hits the street?

    2. Relevant equations

    3. The attempt at a solution
    For the time I got 9.8s and for the velocity I got -66.04 m/s. I'm not sure where I went wrong.
  2. jcsd
  3. Dec 5, 2013 #2
    You didn't provide the initial velocity.
  4. Dec 6, 2013 #3
    Sorry about that. The initial velocity is 18 m/s.
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