A stone is projected horizontally from the top of a tower with a speed of 5ms-1. It lands on the ground level at a horizontal distance of 20m from the foot of the tower. Calculate the height of the tower. (g = 10ms(^{-2}))
Explanation
H = (frac{1}{2} gt^2) S = ut
t = (frac{5}{u} = frac{20}{5} = 45)
H = (frac{1}{2}gt^2 = frac{1}{2} times 10 x 4^2)
= 80m