An electron and a positron move directly towards each other

PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation

Problem

An electron and a positron move directly towards each other, each possessing kinetic energy

0.30\,\text{MeV}

just before collision. They annihilate on contact. Assuming their speeds are non-relativistic, determine the energy of each photon emitted.