1. The problem statement, all variables and given/known data Two particles move parallel to the x axis about the origin with the same amplitude and frequency. At a certain instant, they are found at a distance A/3 from the origin, on opposite sides of the origin, with their velocities in the same direction. Find the phase difference. 2. Relevant equations Phasor diagram, with the projection on the y axis executing shm 3. The attempt at a solution What have I done wrong?