Answer
$T=0.34s$
Work Step by Step
As we know that
$mg=Kx$
This can be rearranged as:
$\frac{m}{K}=\frac{x}{g}$
We plug in the known values to obtain:
$\frac{m}{K}=\frac{\frac{0.058}{2}}{9.8}=0.002959$
Now we can find the time period as
$T=2\pi\sqrt{\frac{m}{K}}$
$\implies T=2(3.1416)\sqrt{0.002959}$
$T=0.34s$
