A cricket ball is struck from a point $O$, which is 2.2 m above the horizontal ground. The ball is projected with speed $U{ms}^{-1}$ at an angle ${\alpha }^{\circ }$ to the horizontal. In its subsequent motion, the ball reaches a maximum height of 5.2 m above the ground. The ball passes over a fielder standing at point $A$. When the ball is vertically above $A$, it is 1.2 m above the ground, and $A$ is at a horizontal distance of 20 m from $O$. The ball is modeled as a particle moving under gravity.