Answer :
To solve this problem, it is necessary to apply the concepts of the Simple Pendulum Period. Under this definition it is understood as the time it takes for the pendulum to pass through a point in the same direction. It is also defined as the time it takes to get a complete swing. Its value is determined by:
[tex]T = 2\pi \sqrt{\frac{l}{g}}[/tex]
Where,
T= Period
l = Length
g = Gravitaitonal Acceleration
With our values we have tat
[tex]T = 2\pi \sqrt{\frac{l}{g}}[/tex]
[tex]T = 2\pi \sqrt{\frac{67}{9.809}}[/tex]
[tex]T = 16.413s[/tex]
Therefore the period of the pendulum is 16.4s