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2. Two spheres are located 0.15 m from one another. Sphere A with a charge of 3.7 X 104 C, is fixed in position, but sphere B with a charge of 4.6 X 10" C starts at rest and then is free to move. Spheres A and B each have a mass of 1.2 X 102 kg. How fast is sphere B moving when it reaches a distance of 0.75 m from sphere A? (Assume all distances are centre-to-centre.) [5 marks] Initial Final 0.15m 0.75m V=? O A qB qA qB