Follow Us :
pendulum is a weight hanging from string so that it can rotate freely, when it is moved force of gravity works on it and it comes to the point where it started from, that is state of equilibrium.
What you want to calculate
Period(T) Length(L) Acceleration of Gravity(g)
Length(L)
m
Acceleration of Gravity(g)
m/s 2
Period(T)
s