Question

Someone help me please

Answer 1

`\begin{gathered} T=\text{ 2}\pi\sqrt[\placeholder{⬚}]{(L)/(9.8)} \\ 4.5=\text{ 2}\pi\sqrt[\placeholder{⬚}]{(L)/(9.8)} \\ (4.5)/(2\pi)=\text{ }\sqrt[]{(L)/(9.8)} \\ 0.7162=\text{ }\sqrt[]{(L)/(9.8)} \\ (0.7162)^2=(L)/(9.8) \\ 0.513(9.8)=L \\ 5.027=L \\ L\approx5.0m \end{gathered}`

Approximately 5 meters long.