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At t = 0, a stone is dropped from a cliff above a lake; 2.0 seconds later another stone is thrown downward from the same point with an initial speed of 33 m/s. Both stones hit the water at the same instant. Find the height of the cliff.

  • Physics -

    I have just recently had to answer a very similar question. My prof. has given me the two general eqns to use:



    From there, write down your knowns and derive more specific eqns from the general ones... Very vague i know...good luck

  • Physics -

    Y1 = -(g/2) t^2
    Y2 = -33(t-2) -(g/2)((t-2)^2

    Set Y1 - Y2 and solve for t.
    Use that t to compute Y at that time.

  • Physics -

    when i solve for t I get an extremely small number like .1998. I don't think I am setting up the problem right or something.

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