Question

a stone is dropped freely from the top of a tower and it reaches the ground in 4 seconds taking g= 10 M per second calculate the height of the tower

Answer 1

given : u=0m/s;t=4sec;g=10m/s;h=?
let us use :h=ut+1/2gt^2
h=(0×4)+1/2×10×4×4
h=10×4×2
h=80
therefore the height of the tower is 80meter.
hope it is helpful for you

Answer 2

h=1/2gt²
=1/2*10*16
h=80m