1. The problem statement, all variables and given/known data Copper nucleus at origin and an electron initially 2 A away from origin. Electron moved to 1A away from origin. What is the change in classical velocity of the electron? 2. Relevant equations PE= (kq1q2)/r change in PE from distance of 2A = KE 3. The attempt at a solution change in PE from distance of 2A = KE KE = 1/2mv^2 Change in PE =PE2-PE1=1/1-1/2= 1-1/2=1/2 J KE=1/2m(v2-v1)^2=1/2 J and solve for v2-v1??? I dont think Im understanding this right.