hi experts, please answer this thank you.

Solution :

$$\begin{gathered} \mathrm{initial} \mathrm{speed}, \mathrm{u}=9 \mathrm{m}/\mathrm{s} \\ \mathrm{height}, \mathrm{h}=5\mathrm{m} \\ \mathrm{final} \mathrm{speed} \mathrm{along} \mathrm{x}-\mathrm{component}, {\mathrm{v}}_{\mathrm{x}}=\mathrm{u} \\ {\mathrm{v}}_{\mathrm{x}}=9 \mathrm{m}/\mathrm{s} \\ \mathrm{because} \mathrm{horizontal} \mathrm{component} \mathrm{of} \mathrm{velocity} \mathrm{is} \mathrm{same} \mathrm{throughout} \mathrm{the} \mathrm{journey}. \end{gathered}$$
acceleration is 0 along x axis thus v is constant