Given
E2−p2c2=m2c4 where E is full energy, p is momentum and m - mass,
and
E=T+E0=T+mc2
we obtain
(T+mc2)2−p2c2=m2c4
T2+2Tmc2+m2c4−p2c2=m2c4
p2c2=T2+2Tmc2
pc=T2+2Tmc2
Let's calculate all in units of GeV, T=200MeV,mc2=938MeV.
pc=2002+2⋅200⋅938=415200=644.36MeV
Answer: p = 644.36 MeV/c.
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