1. The problem statement, all variables and given/known data Two charges with e+ and e- charge are separated a distance "a" apart. Assuming there's no gravity, how long does it take for the charges to collide? 2. Relevant equations My professor said to use conservation. I'm guessing he means Wnc = (KE + PE) - (KEo + PEo) 3. The attempt at a solution I have no clue where to start. Can anyone help me out?