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Proton distance help

  1. May 3, 2010 #1
    1. The problem statement, all variables and given/known data
    A proton is released from rest at t=o in a uniform electric field whose magnitude is 2.5e-8 N/C. How far has the proton traveled after .5 s?

    2. Relevant equations

    x = vot + 1/2at^2

    3. The attempt at a solution
    x = 1/2(9.81)(.5)^2 = 1.2 but it says the answer is .3m. I'm prety sure I'm using the correct equation so I don't know what is wrong.
  2. jcsd
  3. May 3, 2010 #2
    Re: Distance

    Fe = q*E = ma Solve for acceleration, a, first. Then do your kinematics. The proton is accelerating in an electric field, I am assuming you dont have to worry about g... Have you not been studying E fields in your class? Remember what you are studying in class and then apply to the "old" ways.
  4. May 3, 2010 #3
    Re: Distance

  5. May 3, 2010 #4
    Re: Distance

    happy day
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