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Will momentum be conserved?

  1. Nov 24, 2007 #1
    1. The problem statement, all variables and given/known data
    Imagine a universe that consists of nothing but two planets of unequal mass. The large planet has a large negative charge and the smaller planet has a large (but different) positive charge. Suppose that at some time these two planets collide. Will momentum be conserved during the collision? Explain.

    3. The attempt at a solution

    I Think momentum conserved because there no external force.
    plz help me
  2. jcsd
  3. Nov 24, 2007 #2

    Shooting Star

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    Let's imagine it in this universe, far removed from other masses which may disturb them appreciably otherwise. Then, yes, total momentum is conserved, because of the reason you stated.
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