A charge Q=5.00 μC is distributed uniformly over the volume of an insulating sphere that has a radius R=12.0 cm. A small sphere with charge q=+3.00 μC and mass 6.00 x 10-5kg is projected toward the center of the large sphere from an initial large distance. What speed must the small sphere have in order to come within 8.00 cm of the surface of the large sphere?