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A particle A was moving at a speed of 0.8 c, with respect to the lab...

A particle A was moving at a speed of 0.8 c, with respect to the lab frame, in the +x- direction, when it decayed into two identical particles F and G , with G having momentum along the +x- direction. The masses of the particles are mA= 100 MeV/c2, mF=mG=30 MeV/c2. What are the momenta and the velocities of each particle F and G in the frame S?

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