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2 discs connected by spring, airborne?

  1. Dec 17, 2016 #1
    1. The problem statement, all variables and given/known data
    2 identical discs each mass m are connected to stiff spring with constant k. when you push down on the top disc and release, will the system be able to lift off ground. if so, how high?

    2. Relevant equations
    f=ma,f=kx,pe=mgh,pe=1/2kxsquared, ke=1/2mvsquared

    3. The attempt at a solution
    1/2kxsquared=mgh
    h=1/2kxsquared/(mg)
     
    Last edited by a moderator: Dec 17, 2016
  2. jcsd
  3. Dec 18, 2016 #2

    haruspex

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    That assumes all the spring potential energy gets converted to gravitational energy. Will that happen?
     
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