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Homework Help: Electron/proton kinetic electric energy

  1. Feb 20, 2009 #1
    1. The problem statement, all variables and given/known data
    an electron starting from rest acquires 3.53keV of kinetic energy in moving from A to B. how much kinetic energy would a proton acquire moving from B to A.

    2. Relevant equations
    me=9.11e-31 kg
    mp=1.67e-29 kg
    1eV=1.6e-19 J

    3. The attempt at a solution
    conservation of energy, using potential energy = 0 at ending points and KE=3.53 at ending point so it should be equal to initial potential energy. But that's equal to q*E*s and i don't know E or s
  2. jcsd
  3. Feb 20, 2009 #2
    nvm, it should just be the same as the electron due to conservation of energy
    so =3.63 keV
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