A ball is released from the top of a tower to height h. It takes T seconds to reach the ground. What is the position of ball in T/3 seconds?

Options

A. h/9 metres from the ground
B. 7h/9 metres from the ground
C. 8h/9 metres from the ground
D. 17h/18 metres from the ground

Answer

C

Explanation

`h = 1/2 xx g T^2`
`x = 1/2 xx g xx (T/3)^2 = 1/2 xx g xx (T^2)/9`
`x = h/9` from top
`h - h/9 = (8h)/(9)` from ground.