On a day when the velocity of sound is 340 m/s, a boy drops a stone from the top of a high tower. if the tower is 50 m tall, how long will it take for the boy to hear the returning sound?

It takes 3.31 s for the boy to hear the returning sound of the stone

Explanation:

Ok, the time after which splash is heard is equal to the time acquired by the stone to reach the ground + time taken by sound to return.

First, u=0 m/s (this is the initial speed with which the stone was thrown), h=50 m (is the height of the tower) and g=10 m/ (is the gravity)

We can use this equation that relates the free fall of the object:

and

t =3.16 s is the time it takes the stone to fall

Second, h=50 m and v=340 m/s (that it's the speed of sound)

We can use this equation:

t=0.15 is the time it takes for the sound to return

Finally, both times are added, obtaining the time in which the boy will hear the returning sound of the stone:

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explanation:

the answer is a)

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