Arock falls of a cliff and falls for 3 seconds. how high was the cliff?

Solution

In this question we have given

time,t = 3 s

here rock is falling from a cliff, Therefore, in this case gravitational acceleration will act on rock which is g=

Let s be the height of cliff

here, initial velocity of rock,u=0

we know from second equation of motion

............(1)

here a=g=

put values of u,t and a in equation (1)

therefore, height of the cliff is 44.1m