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Homework Help: Speed of an Electron in an Electric Field

  1. Jan 15, 2008 #1
    Two stationary positive point charges, charge 1 of magnitude 3.75 and charge 2 of magnitude 1.95 , are separated by a distance of 30.0 . An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges.

    What is the speed of the electron when it is 10.0 from charge 1?
    Express your answer in meters per second.

    so i have KE = - U
    which is

    1/2mv^2 = - k Q_1q_2 / r

    but then i am confused where should i calculate from?
  2. jcsd
  3. Jan 15, 2008 #2
    i got it... thanks everyone
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