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A neutral K meson (mass 497.7 MeV/c²) is moving
with a kinetic energy of 77.0 MeV. It decays into a pi
meson (mass 139.6 MeV/c²) and another particle of
unknown mass. The pi meson is moving in the direc-
tion of the original K meson with a momentum of
381.6 MeV/c. (a) Find the momentum and total rela-
tivistic energy of the unknown particle. (b) Find the mass
of the unknown particle.

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