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Question

A stone is kicked horizontally from the edge of a cliff. The stone is kicked at 7m/s and takes 3 seconds to reach the ground at the base of the cliff.
Which one of the following is closest to the height of the cliff?

A
21 meters
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B
45 meters
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C
66 meters
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D
90 meters
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Solution

The correct option is D 45 meters
Time of flight T=3 s
Time of flight T=2hg where h is the height of the cliff
3=2h10 h=45 m

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