Two small metal spheres with masses 2.0 g and 4.0 g are tied together by a 5.5 cm--long massless string and are at rest on a frictionless surface. Each is charged to +2.5uC .
1) What is the energy of this system?
2) What is the tension in the string?
3) The string is cut. What is the speed of each sphere when they are far apart?