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Homework Help: Vertical Motion Homework Problem

  1. Feb 12, 2014 #1
    1. The problem statement, all variables and given/known data
    A rock is thrown vertically upward from the edge of a cliff. The rock reaches a maximum height of 18.6 m above the top of the cliff before falling to the base of the cliff, landing 6.60 s after it was thrown. How high is the cliff? Assume gravity= 9.8m/s2

    2. Relevant equations
    Vyf=Vyo + at
    Y=Yo + 1/2(Vyo+Vyf)t
    Y=Yo + Vyot + 1/2at2
    Vyf2=Vyo2+ 2a(y-yo)

    3. The attempt at a solution
    I don't know where to start. I must figure out initial speed and the difference between the cliff and the max height. Is the initial position 0 at the height of the cliff or at the max height? Do I care that when the ball reaches the max height the speed is 0?

    EDIT:Figured it out, I had the dumb for few minutes
    Last edited: Feb 12, 2014
  2. jcsd
  3. Feb 12, 2014 #2
    Solve it graphically, velocity vs. time.
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