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Homework Help: A problem on kinetic energy

  1. Sep 7, 2008 #1


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    1. The problem statement, all variables and given/known data

    An electron starting from rest acquires 5.4keV of KE moving from point A to point B.
    1. How much KE would a proton acquire, starting from rest at B and moving to point B.
    2. Determine the ratio of their speeds at the end of their respective trajectories.

    2. Relevant equations

    I am not for sure

    3. The attempt at a solution

    I am sorry I don't even have an attempt because I don't even know where to begin. I am so confused on this one.
  2. jcsd
  3. Sep 7, 2008 #2


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    Homework Helper

    1. I don't think there is any difference in the amount of KE an electron would get from A to B, but you have to be more specific, is there an electric field somewhere along the path?

    2. From the formula for KE, can you tell what are the respective speeds if they have the same KE?
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