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1. Consider inertial reference frame S to be the lab frame. A proton is moving in the positive x (+x)
direction at a kinetic energy of 1250 MeV, as measured in frame S. Inertial reference frame S' moves at
a speed of 0.55c in the positive-x (+x) direction relative to frame S.
a) Find the speed of the proton in terms of the speed of light, c, as measured in frame S.
b) Find the magnitude and direction of the speed of the proton as measured in frame S'.

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