1. The problem statement, all variables and given/known data Two identical particles, each with a mass of 2.0 mg and a charge of 25 nC, are releasedsimultaneously from rest when the two are 4.0 cm apart. What is the speed of either particle at the instant when the two are separated by 10 cm? 2. Relevant equations PE=ke*q1q2/r 3. The attempt at a solution I have calculated the PE at 1.40e-4 V, but don't know where to go from there.