A man moving towards a vertical cliff at a constant velocity of u m/s , fires a gun and hears the echo after t sec. If he was at a distance of d m. from the cliff when he fired the gun, the velocity of sound in air is _____ m/s.
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When the man fires the gun and hears the echo after t seconds, then the man would have travelled the distance ut. So the correct option is C. Note: Velocity of sound depends upon the medium through which it is travelling.
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