a) Calculate the electric potential energy of a system of two point charges: q1 = 2.00x10-6 C and q2 = -3.50x10-6 C, separated by 0.250 m. (Assume zero potential energy when the charges are infinitely separated.)

b) Suppose the charge, q1, is held in place and the other charge, q2, which has a mass of 1.50x10-3 kg, is shot away from charge, q1 with speed v0. What initial speed, v0, would the moving point charge, q2, need in order to escape completely from the attraction of the fixed charge, q1? (To escape the moving charge, q2, would have to reach a speed of zero when it was infinitely distance from q1.)