7.11 meters
Explanation
to solve this we need to use this formula:
[tex]y_{\max }=\frac{(v_f-v_{1)^2}}{2g}[/tex]Step 1
Let
[tex]\begin{gathered} v_f=0\text{ ( when it reaches the ma}\Xi mun\text{ heigth)} \\ v_0=\text{ initial sp}eed=11.83\text{ m/s} \\ g=9.8\text{ }\frac{\text{m}}{s^2} \end{gathered}[/tex]now,replace and calculate
[tex]\begin{gathered} y_{\max }=\frac{(v_f-v_{1)^2}}{2g} \\ y_{\max }=\frac{(-11.83\frac{m}{s})^2}{2\cdot9.8\frac{m}{s^2}} \\ y_{\max }=\frac{139.4989}{19.6}m \\ y_{\max }=7.11\text{ m} \end{gathered}[/tex]therefore, the answer is
7.11 meters
I hope this helps you