1. The problem statement, all variables and given/known data Two charged, parallel, flat conducting surfaces are spaced d = 1.3 cm apart and produce a potential difference ΔV = 625 V between them. An electron is projected from one surface directly toward the second. What is the initial speed of the electron if its comes to rest just at the second surface? 2. Relevant equations Velocity=sqrt(2qV/m) U=sqrt(2V(e/m)) 3. The attempt at a solution Are those equations the right ones to use for this problem? Usually, I try to find my physics homework on yahoo answers or even on this website, but I haven't had much luck in finding it or relevant equations. How do I start on this problem?