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A subatomic particle X spontaneously decays into two particles, A and B, each of rest energy 140 MeV. The particles

A subatomic particle X spontaneously decays into two particles, A and B, each of rest energy 140 MeV. The particles fly off in opposite directions, each with speed 0.827c relative to an inertial reference frame S. Which expression gives the momentum of particle A (relative to frame S)?

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