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Centre of Mass of two Gravitating bodies from rest

  1. Apr 7, 2009 #1

    How would I show that the centre of mass of two point particles, one of mass m1 and the other m2, when released from rest from infinite simultaneously, stays in the same place?

    I feel this is a very simple question, I just can't seem to get it right. Everything I've tried still involves time in it...

    Thanks for any help!
  2. jcsd
  3. Apr 7, 2009 #2
    Have you tried conservation of (total) momentum?
  4. Apr 7, 2009 #3
    D'oh. I was right, it was very simple. Thanks for that!
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