A stone dropped from the top of the tower touches the ground in $4 \,sec$. The height of the tower is about..........$m$
A stone dropped from the top of the tower touches the ground in $4 \,sec$. The height of the tower is about..........$m$
$80$
$40$
$20$
$160$
A stone dropped from the top of the tower touches the ground in $4 \,sec$. The height of the tower is about..........$m$
$h = \frac{1}{2}g{t^2} = \frac{1}{2} \times 10 \times {(4)^2} = 80\;m$