The two metal balls of mass m1 = 3 g (diameter = 3 mm) and m2 = 4 g (diameter = 4 mm) comprise positive charges of q1 = 4 nC and q2 = 5 nC, respectively. The force holds them in place so that their centers are separated by 8 mm. Determine their velocities after the force is eliminated and they are separated by a big distance?