# Q.13.  A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given,          and speed of sound = .

Answers (1)

Given the height of the tower, ,

and the velocity of the sound, ,

Acceleration due to gravity,

Let the initial velocity of the stone, , as the stone is initially at rest.

Let the time taken by the stone to fall to the base of the tower be

Now, according to the IInd Equation of Motion:

.

Now, the time taken by the sound to reach the top from the base of the tower,

Therefore, the splash is heard at the top after time,

Calculating

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