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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?

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(Given g = 10 ms-2 and speed of sound = 340 ms-1

Height = 750m 

h = ut + 0.5 gt2 

The initial velocity is 0 750 = 0.5 × 10 × t2 

t = 10 sec

Speed of sound is 340m/sec 

So, time taken to travel 750m upwards is,

\(\frac{750}{340}\) = 2.20 S

time taken = 10 + 2.20 = 12.2 sec.

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