Question

a stone is dropped in a river from a bridge . if it takes 4 seconds to reach of the surface of water, calculate the depth of the water level from the bridge. akso calculate the velocity with which the stone strijes the water surface.​

Answer 1

The stone takes 4sec to reach the water level.

initial velocity (u)=0

time(t)=4s

acceleration due to gravity(a)=

9.8(10 approx)

so,its final velocity will be

v=u+at

0+10×4=40

v=40m/s