Два точечных положительных заряда закреплены на некотором расстоянии друг от друга. Один из зарядов освобождают, и он летит вдоль силовых линий поля другого заряда. Как изменяется потенциальная энергия силы зарядов?

in order to maximize the electric force they should have equal charges i.e qt/2 for each

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me