Question

a stone is dropped freely from the top of a tower and it reaches the ground in 4 seconds taking g = 10 m/s^2 calculate the height of the tower

Answer 1

80m
s = ut + 1/2 at^2
s = h, initially u = 0, a= g
h = 0 + 1/2 * 10* 16
h = 80m