A store s dropped from the top of building of height 5m into a pond A boy is standing on top of building Calculate the time in which the boy will hear the sound of splash of stone. The speed of sound in air is 320 m/sec.
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the boy will became at this time like(shaktiman)
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The time at which stone hits the ground can be found by s=ut+ 21gt 2
∴300=0×t+ 21 ×9.8×t 2
∴t=7.82s
Now, the time for sound to travel 300m is t= 340 300
=0.88s
Therefore, total time will be addition of the two times.
t=7.82+0.88=8.7s
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