A particle is projected vertically upwards from point A on the ground. It takes t1 time to reach a point B but it still continues to move up. If it takes further t2 time to reach the ground from point B then height of point B from the ground is :

A) 1/2*g*(t₁ +t₂)²

B) gt₁t₂

C) 1/2*g*(t₁ + t₂)²

D) 1/2*g*t₁ t₂

Xplain the solution.........