7 A small ball is projected at an angle of \(50 ^ { \circ }\) above the horizontal, from a point \(A\), which is 2 m above ground level. The highest point of the path of the ball is 15 m above the ground, which is horizontal. Air resistance may be ignored.
- Find the speed with which the ball is projected from \(A\).
The ball hits a net at a point \(B\) when it has travelled a horizontal distance of 45 m .
- Find the height of \(B\) above the ground.
- Find the speed of the ball immediately before it hits the net.