A Good Order squad declares armoured assault and after spending 2 MP with its friendly AFV, goes berserk. It charges the nearest unit etc - can the AFV continue moving?
Yes. The only restriction on the AFV is that it can't move farther than the infantry "could" have moved.
D9.31 "...that AFV cannot move farther than if it were accompanied by that same Infantry throughout the move - even if that Infantry fails to end its MPh in the same hex with the AFV..."