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Blocks with light springs

  1. Nov 7, 2007 #1
    Blocks with light springs (q31)

    Hi, I have not idea how to do the following problem(all attempts failed):
    http://tinyurl.com/28lahv

    Can somebody help?
     
    Last edited: Nov 7, 2007
  2. jcsd
  3. Nov 7, 2007 #2
  4. Nov 7, 2007 #3
    Sorry, I am not sure how to start the question with...just hope anyone can shed me some light.
     
  5. Nov 7, 2007 #4
    OK. As a first step can you describe the energy transfer(s) that happen?
     
  6. Nov 7, 2007 #5
  7. Nov 7, 2007 #6

    learningphysics

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    Homework Helper

    Use conservation of energy and conservation of momentum. remember the spring is light, so just assume its mass is 0.
     
  8. Nov 7, 2007 #7
    Got it, thanks:)
    Followed is the working:
    By conservation of momentum
    0=3*2+2*v
    v=3m/s
    Potential energy stored in the spring
    = sum of total kinetic energy
    =0.5*2*(3)^2+0.5*3*(2)^2
    =15J
     
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