<PRE><B>Question 255529</B>
A stone is thrown horizontally off a cliff with a velocity of 10 m/s. If it takes 5 seconds for the stone to hit the ground, how his is the cliff?
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s(t) = -9.8t^2 + vot + so
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so is the height of the cliff.
s(t) is 0 when the stone hits the ground.
Since the stone is not thrown up and down vo is 0.
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Find 9.8(5)^2 = 9.8*25 = 245 meters (height of the cliff)
Cheers,
Stan H. 
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