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Homework Help: Electric Potential problem escape veloctiy.

  1. Oct 18, 2007 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations

    My attempt at the equation:
    Vi = sqrt(2/m * ((K*1.5nC*e/.005m) + (K*1.5nC*e/.005m)))

    3. The attempt at a solution

    My equation gives me a value that is too large. Any help appreciated.

    I noticed if I change the 2/m to 1/m and divide my final answer by 2 it is a value around the size of the answer...
  2. jcsd
  3. Oct 18, 2007 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    The kinetic energy must equal the electric potential energy (EPE) of the proton at the current position, which seems to be the approach one has taken.

    Then one can determine the v from KE.

    Getting the EPE correct is the key. The proton is equidistant between two equal charges.

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