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Finding Average Velocity

a boy drops a...

Question

a boy drops astone from a cliff ,which reaches the ground in 20s calculate height of cliff

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Solution

Given, t = 20 s
As stone is dropped from the cliff, u = 0 m/s
a = 9.8 m/s²
As, s = u t +1/2 at²
s = 1/2 X 9.8 X (20)² = 1960 m

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