A stone is released from the top of a tower of height 1960 m. calculate the time taken by the stone to hit the ground.

Explanation

Here, `u=0 s=h=1960m`.
`a=g=9.8m//s^(2), t=?`
From `s=ut+(1)/(2)at^(2)`
`1960=0+(1)/(2)xx9.8T^(2)=4.9T^(2)`
`t^(2)=1960/4.9=400`
`t=sqrt400=20s`