a men sitting nearby a cave of mountain hears the clear echo of his whistle in 0.25 second. how far is he from mountain? (take v=332m/s).
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Let the distance be d
Time taken by the sound of his whistle to cover the distance 2 times ( to and away from the mountain) is 0.25 seconds
velocity = distance/time
332m/s = 2d/0.25s
2d = (332*0.25)m = 83m
d = (83/2)m = 41.5m
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