\(\frac{t}{L}\) = \(\sqrt{(\frac{4\pi^2}{g}})\) Take square of both sides \(\frac{t^2}{L^2}\) = \(\frac{4\pi^2}{g}\) Cross multiply t\(^2\)g = L\(^2\)4\(\pi\)\(^2\) g = \(\frac{4\pi^2L^2}{t^2}\) g = \(\frac{4 \times 4.5 \times 4.5 \pi^2}{5^2}\) g = \(\frac{799.44}{25}\) = 31.9776 ≈ 32m/s\(^2\)