Question: An electron and a positron, each moving at 1.0 x 105m/s, collide head on, disappear, and produce two photons, each with the same energy and

An electron and a positron, each moving at 1.0 x 105m/s, collide head on, disappear, and produce two photons, each with the same energy and momentum moving in opposite direction. What is the energy and momentum of each photon?

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