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    tai21080's Avatar
    tai21080 Posts: 1, Reputation: 1
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    #1

    Feb 2, 2009, 08:05 PM
    I'm completely stuck and don't even understand the equations
    The question I am working on is:
    A stone is thrown vertically upward with a speed of 12.0 m/s from the edge of a cliff 75.0 m h. (a) How much later does it reach the bottom of the cliff? (b) What is its speed just before hitting? (c) What total distance did it travel?

    I am lost I thought I was on the right track but then my friend showed me her work and now I'm even more lost.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Feb 3, 2009, 08:47 AM
    You can answer all of these by letting the 'thrown from' position be the origin(0,0).

    To find how long to get to the bottom of the cliff, use

    , set to -75 and solve for t. Of course,

    Also, you can use to find velocities at various points.
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