On Diwali, a child Plants a bomb at a place and starts running at 60 m/s. After 58 seconds the bomb blasted. In how much time the sound of blast will beheard by the child, if the speed of sound is 640 m/s.
Speed of child = 60 m/s Speed of sound of Bomb = 640 m/s Distance travelled by child in 58 seconds = (60 × 58) m The time taken by the sound of blast to be listened by him T = D/S = (60 ×58)/(Relative Speed ) = (60 ×58)/((640-60)) = (60 ×58)/580 = 6 seconds
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