Particle Q1=Q1=2.2?C?C has a mass of 5.5?g?g, and particle Q2=Q2=4.3?C?C has a mass of 7.6?g?g. What is the potential energy, in joules, of the two-charge system when charge Q2Q2 is separated from charge Q1Q1 by a distance of 4.6 cm? The two-charges are initially separated by a distance of 4.6 cm. With charge Q1Q1 held in place, charge Q2Q2 is released from rest. What is the speed, in meters per second, of charge Q2Q2 when it is 6.9 cm from charge Q1Q1?