A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. When is the splash heard at the top ? (Given `g=10 ms^(-2)` and speed of sound `=340 m s^(-1)`).
Text Solution
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Height = 750m `h=ut+0.5 g t^(2)` The initial velocity is 0 `750=0.5 xx 10 xx t^(2)` `t=10sec` Speed of sound is 340m/sec So, time taken to travel 750m upwards is, `750/340=2.20s` time taken `=10+2.20=12.2 sec`.
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