Point A is at a potential of +250 V, and point B is at a potential of -150V. an alpha particle is a helium?

oint A is at a potential of +250 V, and point B is at a potential of -150V. an alpha particle is a helium nuclues that contains two protons and two neutrons; the neutrons are electrically neutral. An alpha particle starts from rest at A and accelerates toward B. When the alpha particle arrives at B, what kinetic energy (in electron volts) does it have?