4. A photon of energy 12 TeV (1 TeV=1012 eV) strikes a particle of mass mo at rest. After the collision there is only a single final particle of mass m, that moves at the speed (6/7) c. Use MeV units and find the momentum of the final particle and the masses m and mo. Q.5 Consider a spaceship A that fires a beam of particles in the forward direction with vecolity v = 0.8c at another spaceship B that is moving directly away at velocity Lorentz transformation of the 4-momentum vector, find the velocity v' of beam in the frame of spaceship B. Q.6 AE- particle with its half-life 1.5 x 10-10 939.6M V) and a negative pion (m,- = 139.6MEV) as: E + n+n. Find the ratio = 0.6c. Using sec. and mass 1197.4 MeV, decays into a neutron (mn of kinetic energies (K.E.)-/(K.E.), of the two final particles in the rest frame of E-.