Question

A pebble is dropped freely in a well from its top. It takes 20sec for the pebble to reach the water

surface in the well. Taking g = 10 m/s2 and speed of sound = 330 m/s ,Find i) the depth of water

surface ii) the time when echo is heard after the pebble is dropped​

Answer 1

Answer:

25 mm yss after the pebble is droped