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hi can you tell me how to answer this please, a proton of kinetic energy 4mev collides with a a stationary neutron, after the proton has kinetic

hi can you tell me how to answer this please,

a proton of kinetic energy 4mev collides with a a stationary neutron, after the proton has kinetic energy of 1 mev. find the mass of the neutron

(given ke = pxp /2m

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