Question

. A pebble is dropped freely in a well from its top.
It takes 20 s for the pebble to reach the water
surface in the well. Taking g = 10 m s-2 and speed of
sound = 330 m s-l, find : (i) the depth of water surface,
and (ii) the time when echo is heard after the pebble is
dropped.​

Answer 1

hii buy dont worg dog cat