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Homework Help: Work-Energy of a Spring

  1. Mar 14, 2013 #1
    1. The problem statement, all variables and given/known data

    A 0.0900 kg glider is pushed up a 40.0° frictionless incline by a spring. The spring's constant is k = 640 N/m with negligible mass. The glider reaches a distance of 1.80 m along the inclined track after losing contact with the spring and then slides back down. What distance is the spring originally compressed?

    2. Relevant equations

    0.5kX2^2 - 0.5kX1^2 = 0.5mV2^2 - 0.5mV1^2

    3. The attempt at a solution

    I have absolutely no idea how we can possibly know the distance of the spring's comression. There does not seem to be enough information here.
  2. jcsd
  3. Mar 14, 2013 #2


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    What can you say about the potential and kinetic energy of the glider when it reaches its highest point? Where did that energy come from?
  4. Mar 15, 2013 #3
    Ahhhh, I see, thanks.
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