(Solved) : Two Insulating Spheres Have Radii R1 . . .

Two insulating spheres have radii r1 and r2, masses m1 and m2, and uniformly distributed charges -q1 and q2. They are released from rest when their centers are separated by a distance d.
(a) How fast is each moving when they collide? (Suggestion: consider conservation of energy and conservation of linear momentum.)
(b) What If? If the spheres were conductors, would their speeds be greater or less than those calculated in part (a)? Explain.

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