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A pi meson of mass m moves with a speed u in the positive y direction in frame S with parameters BETA = u/c and

GAMMA = 1/[sqrt(1 - BETA^2)].
The pion decays into two gamma rays. An observer S' moves in the positive x direction with speed v = BETA'c and detects the two photons.
A. Compute the sum of the x components of momentum in S' for the photons.
B. Compute the combined energy of the two photons in S'.

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