1. The problem statement, all variables and given/known data Two particles A and B are projected from the same point O with angle speed 30degree from the horizontal. If A has the speed of projection equal to (7)^0.5m/s and B has twice the projection speed,find the separation between them,when their velocities are mutually perpendicular to each other. 2. Relevant equations 3. The attempt at a solution I can't solve it. I need hints regarding the perpendicular part,how can i form an equation linking both of them? Or anything link between the perpendicular part. Thanks for helping.