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da_warped_1

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A particle with rest mass

*m*has kinetic energy equal to twice its rest energy. The particle decays into 2 photons which emerge in opposite directions, one traveling in the same direction as the particle before its decay. Find expressions, in terms of

*m*for:

(a) the momentum of the particle

(b) the energy of each of the 2 photons

thanks for any help.