Solution
Given the distance h as
[tex]h=\frac{1}{2}t^2[/tex]Here,
[tex]\begin{gathered} g=980\text{ cm/sec}^2 \\ \\ t=20\text{ sec} \end{gathered}[/tex]Therefore, the distance h is: 196000 cm
[tex]h=\frac{1}{2}\times980\times20^2=196000\text{ cm}[/tex]