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A neutron intially at rest, decays into ...

A neutron intially at rest, decays into a proton, an electron and an antineutrio. The ejected electron has a momentum of `p_(1) = 1.4× 10^(-28)` kg-m/s and the antineutrino `p_(2) = 6.5 ×10^(–27)` kg-m/s. Find the recoil speed of the proton
if the electron and the antineutrino are ejected along the the same direection.

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The correct Answer is:
`(p_(1)+p_(2))/(m_(p))=12.3m/sec`
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