A neutron (mn= 939.6 MeV/c2) at rest decaysinto a proton (mp= 938.3 MeV/c2), an electron(me = 0.5 MeV/c2), and an antineutrino(mν ˜ 0). The three particles emerge atsymmetrical agnles in a place, 120 degrees apart. Find the momentum and kinetic energy of each particle.