A particle decays in flight into two pions, each having a rest energy of 140.0 MeV. The

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A particle decays in flight into two pions, each having a rest energy of 140.0 MeV. The pions travel at right angles to each other with equal speeds of 0.900c. Find 

(a) The momentum magnitude of the original particle, 

(b) Its kinetic energy, 

(c) Its mass in units of MeV/c2.

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