Pendulum help PLLLLLLLLLLLEASE!! Hi im just doing typical first yr physics pendelum Im trying to calculate the frequency of of the oscillation of the pendulum and also calculate the period of oscillation here are the details: 2 m long string pendulum 200g mass attached to it initial amplitude of 10 cm and had to calculate the period of oscillation ?? i use the typical 2pi*square root ( L/g) where is use valcues 2 m and g= 9.8 m/s 2 ??? is this right way ??? for frequency of oscillation which formula i shud use??? plz help and if the initial amplitude now is 20 cm ... ????