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Assume the distance from the cliff as x.So for the echoe to b heard sound has to travel 2x distance.Now time period of
seconds pebdulum is 2s.Frome mean to extreme means T/4 i.e. 2/4=1/2.So in 0.5s echoe will b heard.Therefore,
D=speed*time
2x=340*0.5 x=85
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