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A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 6.9 s later. How high is the cliff?
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A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 6.9 s later. How high is the cliff?

User Son Huynh
by
8.2k points

1 Answer

3 votes
This is provided it starts from rest:
t=6.9 u=0 a=-9.8 (acceleration due to gravity) s=?

S=ut+0.5at^2
S=0+0.5(-9.8)(6.9^2)
S=(-4.9)(47.61)
s=-233.289m (minus is because it’s below starting point)
s=233.289metres
User Pierre Buyle
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8.6k points
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