Question: Protons in cosmic rays have been observed with kinetic energies as large as 1.0 1020 eV. (a) How fast are these protons moving? Give

Protons in cosmic rays have been observed with kinetic energies as large as 1.0 × 1020 eV.
(a) How fast are these protons moving? Give your answer as a fraction of the speed of light.
(b) Show that the kinetic energy of a single one of these protons is much greater than the kinetic energy of a 15-mg ant walking with a speed of 8.8 mm/s?

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