1. The problem statement, all variables and given/known data Why is the velocity the same at minimum separation? For example, two positively charged pucks are travelling towards each other. Find the minimum separation. They oppose each other so they should slow down and reach minimum separation when their velocities are 0. It does not make sense to solve for when their velocities are the same. Because I get an answer of 1.0m/s, but how can they be at minimum separation if they are still moving? 2. Relevant equations Conservation of momentum 3. The attempt at a solution Use conservation of momentum to solve for the velocity. This is what the book says, but why? Shouldnt the minimum distance be when both of their velocities are 0?