1. The problem statement, all variables and given/known data They were going to purchase an electron microscope, and wanted the electrons velocity to be as high as 25% of the speed of light after acceleration. There was a microscope at hand that had an accelerating voltage of 40 kV. a) How large is the electrons relativistic mass when it hits the target expressed in m0? b) Is the voltage high enough to reach at least25% of the speed of light? 2. Relevant equations qV=K mv2/2=K E2=m2c2+p2c2 E=K+mc2 p=mvγ 3. The attempt at a solution Don't know where you use the rest mass and where you get the relativistic mass? Not sure how to figure this out.