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Electric Fields and Final Velocity of point particle question? Electric Fields and F

  1. Feb 10, 2012 #1
    1. The problem statement, all variables and given/known data

    A fixed charge Q= +3.65 µC is held fixed at the origin of an xy plane. A second charge q= +5.11 µC is released from rest at the xy coordinate of (+1.15 m, +0.810 m).

    a) (a) If the mass of q is 2.90 g, what is its speed when it moves infinitely far from the origin?

    (b) At what distance from the origin does q attain half the speed it will have at infinity*?
    (*Please note where most of the energy exchange occurs!)

    --------

    2. Relevant equations

    Ei=Ef
    KQq/r=Fe=qV
    1/2mv^2


    3. The attempt at a solution

    I solved for a) and got 9.07202 m/s
    Can't seem to figure out way to do b. Initially I just took 1/2 the velocity I got in a), plugged it into the equation KQq/r=1/2mv^2 to solve for a n R, but that's wrong. Any help is appreciated.
     
  2. jcsd
  3. Feb 10, 2012 #2
    Re: Electric Fields and Final Velocity of point particle question? Electric Fields an

    What did you get?
     
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