5.49 Two positively charged spheres, each with a charge of 2.0 x10-5 C, a mass of 1.0 kg, and separated by a distance of 1.0 cm, are held in place on a frictionless track. (a) What is the electro- static potential energy of this system? (b) If the spheres are released, will they move toward or away from each other? (c) What speed will each sphere attain as the distance be- tween the spheres approaches infinity?​