[tex]\begin{gathered} h=\text{ }12.2m \\ g=9.81m/s^2 \\ t=\text{?} \\ h=\frac{gt^2}{2} \\ \text{Solving t} \\ 2h=gt^2 \\ t^2=\frac{2h}{g} \\ t=\sqrt{\frac{2h}{g}} \\ t=\sqrt[]{\frac{2(12.2m)}{9.81m/s^2}} \\ t=\sqrt[]{\frac{24.4m}{9.81m/s^2}} \\ t\approx1.6s \\ To\text{ reach the ground it takes 1.6 s} \end{gathered}[/tex]
