A pi meson of rest mass 1396 mev collides with a neutron, Ask an Expert

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A π+ meson of rest mass 139.6 MeV collides with a neutron (rest mass 939.6 MeV)stationary in the laboratory system to produce a K+ meson (rest mass 494 MeV)and a hyperon (rest mass 1115 MeV). What is the threshold energy for this reaction in the laboratory system?

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