Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    Tide

    User Avatar
    Science Advisor
    Homework Helper

    I think the piece of information you're missing is that momentum is conserved in the process.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook