Question

A boy fires a gun and hear an echo after sometime. If he is 550 m away from a wall and velocity of sound is 275 m/s, calculate the time.​

Answer 1

Explanation:

S=550m

V=275m/s

We know that s=1/2at^2 (u=0)

550=1/2× 275/t×t^2

550= 275t/2

t=4s

there you go...