Question

Two metal spheres with masses 4.0 g and 6.0 g are tied together with 6.0 cm long massless string and are at rest on a frictionless surface. Each sphere is charged to + 5.0 nC.
a. What is the energy in the system?

b. What is the tension in the string?

c. The string is cut. What is the speed of the 4.0 g sphere when they are far apart?
The energy is equal to (kq^2)/r

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