1. The problem statement, all variables and given/known data An electron is accelerated through a potential of 10^9 Volts. What is the Energy, Kinetic Energy, and Momentum in the lab reference frame? 2. Relevant equations (1/2)mv^2=eV=1.6E-10 J=1000 MeV 3. The attempt at a solution Solving for the kinetic energy gives 1000 MeV, which then solving for v gives 2E10 m/s, which is greater than the speed of light.. In the rest frame of the electron, E=mc^2=8.2E-14 J, then I need to multiply that by γ to get the energy in the lab reference frame, but I can't solve for v, because I got v>c. What am I doing wrong?? Thanks in advance!