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Homework Help: Speed of an electron

  1. Jan 18, 2010 #1
    1. The problem statement, all variables and given/known data

    An electron is released from rest in a weak electric field given by vector E = -3.00 10-10 N/C jhatbold. After the electron has traveled a vertical distance of 1.4 µm, what is its speed? (Do not neglect the gravitational force on the electron.)

    2. Relevant equations

    3. The attempt at a solution

    We haven't been taught this, so any help on how to do it would be wonderful.
  2. jcsd
  3. Jan 18, 2010 #2


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    Homework Helper

    What is the net force acting on the electron in the electric field?
    Work done = F*d = 1/2*m*v^2.
    From this find v.
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