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.

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

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6