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Two Jupiter Size

  1. Dec 2, 2013 #1
    1. The problem statement, all variables and given/known data
    two Jupiter-size planets are released from rest 1.50×1011m apart.
    What is their speed before crash

    2. Relevant equations
    GMm/r=U
    KE=-GMm/2r

    3. The attempt at a solution
    I tried setting U+KE=Uf+.5mv^2 and solve for V but it doesn't work :(
     
  2. jcsd
  3. Dec 2, 2013 #2

    ehild

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    Gold Member

    Hi jorn0807, welcome to PF.:smile:

    Show your work in detail - where does the size of the planets come in? What is the final state ? How far are the planets then? And what is the initial kinetic energy, if the planets are released from rest? (just imagine that you hold a Jupiter-size planet and then you release it ...:biggrin:)

    ehild
     
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