1. The problem statement, all variables and given/known data Two electrons separated by a large distance are fired directly at each other. The closest approach in this head-on collision is 4.0 * 10-14 m. One electron starts with twice the speed of the other. Assuming there is no deflection from the original path, determine the initial speed of each electron. 2. Relevant equations Ee = kq1q2 / r Ek = 1/2 mv2 3. The attempt at a solution I'm really lost as to how to start this. It must have something to do with electrical and kinetic energy but other than that I am mystified as to how to solve this.