1. The problem statement, all variables and given/known data Across what potential difference does an electron have to be accelerated in order to reach speed v=1.80×106 m/s? 2. Relevant equations I checked to see if relitivity was important and it was not E=.5 m v^2=eV 3. The attempt at a solution I dunno if I am mistaken in what I am trying to find but I thought the potential difference in this case was .5mv^2 But when I plug in 9.109x10^-31 kg in for the mass and 1.8x10^6 m.s for the velocity I don't get the right answer. I do not know what I am doing wrong.