Two insulating spheres have radii 0.3cm and 0.5cm, masses 0.1kg and 0.7kg and uniformly distributed charges of -2 [tex]\mu[/tex]C and 3 [tex]\mu[/tex]C. they are released when the distance from their center are 1m apart. How fast will each be moving when they collide. Firstly, what is the radius of the sphere use for? Secondly, I calculated the electric potential energy of the system but what is this energy equivalent to? Lastly, how can we solve this question if the spheres were conducting spheres?