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Homework Help: Homework help

  1. Sep 12, 2005 #1
    Particles A (of mass m and charge Q) and B (of mass m and charge 5 Q) are released from rest with the distance between them equal to 0.4939 m. If Q= 31 uC, what is the kinetic energy of particle B at the instant when the particles are 2.4939 m apart? Answer in units of J.

    I know that the initial kinetic energy is zero since the particles start from rest. I also know that you can relate the change in electrical potential to kinetic energy. I'm a little confused on how to set it up though.
  2. jcsd
  3. Sep 13, 2005 #2


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    I think the piece of information you're missing is that momentum is conserved in the process.
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