Two insulating spheres have radii 0.300 cm and 0.500 cm, masses 0.400 kg and 0.700 kg, and uniformly distributed charges of -2.00
μ
c and 5.50
μ
c. they are released from rest when their centers are separated by 1.00 m.

(a) how fast will each be moving when they collide? (hint: consider conservation of energy and of linear momentum.)
(b) if the spheres were conductors, would the speeds be greater or less than those calculated in part (a)? (note: assume a reference level of potential v = 0 at r =
[infinity]
.)