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A proton (mass mp = . MeV 938.3 CE ) is movin with speed 0.4c along the x-axis relative to the laboratory frame. What is the value of the first element of the four-momentum P^{0} for the proton?

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\begin{matrix} (1) &1210\frac{MeV}{c} \\ (2) &1117\frac{MeV}{c} \\ (3) &1023\frac{MeV}{c} \\ (4) &409.1\frac{MeV}{c} \\ (5) & 84.45\frac{MeV}{c} \end{matrix}

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