From a point on the ground at a distance `a` from the foot of a pole, a ball is thrown at an angle of `45^@`, which just touches the top of the pole and strikes the ground at a distance of `b`, on the outer side of it. Find the height of the pole.

From a pint on the ground at a distance 15 m from the foot of a vertical wall, a ball is thrown at an angle of 45^(@) which just clears the top of the wall and afterwards strikes the ground at a distance 5 m on the other side. Find the height of the wall.

From a point on the ground at a distance of 2m from the fot of a verticle wal, a ball is thrown at an angle of 45^(@) which just clears the top of the wall and then strikes the ground at distance of 4m from the foot of the wall on the other side. The height of the wall is

A body is projected at an angle of 45^(@) from a point on the ground at a distance of 30 m from the foot of a vertical pole of height 20m. The body just crosses the top of the pole and strikes the ground at a distance s from the foot of the pole on the other side of the pole. Then, s

A body is projected at an angle of 45^(@) with horizontal from a point on ground at distance 6m from the foot of a vertical pole. It just crosses the top of the pole and falls on ground on the other side at a distance of 3m from the foot of the pole. The height of the pole is: