Question

a splash is heard 3.12 after a stone is dropped into a well 45m deep . the speed of sound in air is (g=10m/s

Answer 1

time taken for the stone to impact the water is


t=
$\sqrt{4.5}$

secs

3.12-t, gives you the time it takes for the sound to reach you after the impact

then

speed of sound in well is = 45/3.12-t