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How to find the amplitude of a pendulum

  1. Dec 1, 2014 #1
    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. jcsd
  3. Dec 1, 2014 #2
    What is x?

    Do you have a figure?
     
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