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Q.

A stone is dropped from the top of a cliff. It is seen to hit the ground below after 4.2 s. How high is the cliff

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a

860 m

b

86.44 m

c

160 m

d

180

answer is A.

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Detailed Solution

t = 4.2 s

$h = \frac{1}{2} \times 9.8 \times {(4.2)}^{2}$

$h = \frac{9.8 {(4.2)}^{2}}{2}$

$= 86.44 m$

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