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Math Help - Homework Prob, physics related

  1. #1
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    Homework Prob, physics related

    A stone is tossed down with a speed of 8m/s from the edge of a cliff 63 m high. how long will it take to hit the foot of the cliff?

    vi= 8
    a= 9.8
    s= 63

    i dont know the physics equation for a item being tossed from a cliff.
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  2. #2
    TD!
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    The stone is subject to gravity. If its initial position height is h(0) and its initial speed v(0), then the equation is:

    h\left( t \right) = h\left( 0 \right) + v\left( 0 \right)t - \frac{{gt^2 }}{2}.

    With g = 9.81 m/sē and h choosen positive in the upwards direction.
    Thanks from jonwen97
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