A particle is projected from the ground at `t = 0` so that on its way it just clears two vertical walls of equal height on the ground. The particle was projected with initial velocity `u` and at angle `theta` with the horiozontal. If the particle passes just grazing top of the wall at time `t = t_1 and t = t_2`, then calculate.
(a) the height of the wall.
(b) the time `t_1 and t_2` in terms of height of the wall.
Write the expression for calculating the range of this projectile and separation between the walls.