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Horizontal Spring Pulled from Equilibrium?

  1. Dec 12, 2012 #1
    ScreenShot2012-12-12at95828AM.png

    I don't necessarily understand the explanation given to the solution.
    Is it basically saying:

    A (valley) --> 0 (equilibrium) --> -A (valley) --> 0 (equilibrium) --> A (valley)?
     
  2. jcsd
  3. Dec 12, 2012 #2

    SammyS

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    What valley are you referring to?

    The block moves horizontally.
     
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