Answer
The period of the pendulum is $4.0~s$
Work Step by Step
We can find the period of the pendulum:
$T = \frac{2\pi}{\omega}$
$T = 2\pi~\sqrt{\frac{L}{g}}$
$T = 2\pi~\sqrt{\frac{4.0~m}{9.80~m/s^2}}$
$T = 4.0~s$
The period of the pendulum is $4.0~s$
