A Subatomic Particle X Spontaneously Decays into Two Particles, a and B

A subatomic particle X spontaneously decays into two particles, A and B, each of rest energy 1.40 × 10² 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) ?

A) 109 MeV/c
B) 140 MeV/c
C) 206 MeV/c
D) 249 MeV/c
E) 314 MeV/c

Correct Answer:

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