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**Pendulum help PLLLLLLLLLLLEASE!**

Hi I am 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? please help and if the initial amplitude now is 20 cm ... ?