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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=4.2s

h=12×9.8×(4.2)2

h=9.8(4.2)22

=86.44m

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