Question: A E- particle with its half-life 1.5 x 10-10 sec. and mass 1197.4 MeV, decays into a neutron (m, = 939.6MeV) and a negative pion

A E- particle with its half-life 1.5 x 10-10 sec. and mass 1197.4 MeV, decays into a neutron (m, = 939.6MeV) and a negative pion (m,- = 139.6MEV) as: 

n+

Find the ratio of kinetic energies (K.E.)-/(K.E.), of the two final particles in the rest frame of  

n+

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