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Speed of proton and alpha particle

  1. Jan 22, 2014 #1
    1. The problem statement, all variables and given/known data
    An alpha particle (4 times the mass of a proton with a charge of +2e) is at rest 1.0 * 10^-12 m from a stationary proton. The 2 particles immediately move apart. Find the speed of each particle when they are infinitely far from each other.


    2. Relevant equations

    Electrical Energy = kq1q2/r
    Kinetic Energy = 0.5mv^2

    3. The attempt at a solution

    I used the equation kq1q2/r to find the potential energy of the system and converted the potential energy into 0.5mv^2 to solve for the velocity. I am not sure that I have the right answer.
     
  2. jcsd
  3. Jan 22, 2014 #2

    lightgrav

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    Homework Helper

    right approach .... but which one is moving faster? how many times as fast is it?
    what fraction of the total KE does the fast one have?
     
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