Representation of data — practice question

A small ball $B$ is launched from $O$ with speed $U\,\text{m s}^{-1}$ at an angle of $\theta\degree$ above the horizontal. Two seconds later, $B$ hits a smooth wall inclined at $60\degree$ to the horizontal. At that instant, the speed of $B$ is $18\,\text{m s}^{-1}$ and its direction of motion is perpendicular to the wall (see Fig. 1). $B$ rebounds from the wall with speed $V\,\text{m s}^{-1}$, again moving perpendicular to the wall. After $0.8\,\text{s}$, $B$ meets the wall again at a lower point $A$ (see Fig. 2).