A pion decays into a muon and a neeutrino in the rest frame, Ask an Expert

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A pion decays into a muon and a neeutrino. In the rest frame of the pion, the muon always has a speed of .507c. If a beam of pions is moving at 0.600c, what will be the speed of the muons in the lab fram if the muon is emitted traveling in the direction of the beam?

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