1. The problem statement, all variables and given/known data Two small metal spheres with masses 2.0g and 4.0g are tied together by a 5.4-cm-long massless string and are at rest on a frictionless surface. Each is charged to +2.1 μC . The string is cut. What is the speed of each sphere when they are far apart? 2. Relevant equations U = Kq1q2/r F = K q1/q2/r^2 m1v1 = m2v2 3. The attempt at a solution I'm not entirely sure how to approach this. I calculated that the energy in the system is .74 J and also the tension in the string is 14 N. How can I use that to my advantage?