An alpha particle (a), which is the same as a helium-4 nucleus, is momentarily at rest in a region of space occupied by an electric field. The particle then begins to move. Find the speed of the alpha particle after it has moved through a potential difference of -3.45x10-3 V The charge and the mass of an alpha particle are ga 3.20x10 19 C and ma 6.68x10 27 kg, respectively.