Question

Kamal dropped a stone in well 45 m deep. If speed
of sound is 340 m s', then after how much time he
will hear the splash?
[Take, g = 10 m s -1​

Answer 1

Answer: after 3 seconds (approx.)

Explanation: s = ut + 1/2 * at^2

                      45 = 0 + 1/2*10*t^2

                      t = 3 seconds

Time taken by sound to reach  Kamal is negligible .