A simple pendulum can be created by suspending a bob of mass $3\mathrm{.}5$ kg from the end of a $1\mathrm{.}5$ m long string. Given this information, which of the following equations would be most appropriate thuse to find the period of this simple pendulum?

$T=\frac{mgx}{L}$

$T=\frac{1}{f}$

$T=\frac{v^{3}m}{L}$

$T=2\sqrt[\phantom{2}]{\frac{m}{k}}$

$T=2\sqrt[\phantom{2}]{\frac{L}{g}}$