How to find the amplitude of a pendulum

1. Dec 1, 2014

Jace Miyagi

How do I find the amplitude of a pendulum with the given information:

Length=0.5 m
Mass=0.25 kg
x=0.2 m
k (constant)=12.25 N/m

Thanks!

2. Dec 1, 2014

Dr.D

What is x?

Do you have a figure?