The electron-volt, eV, is a unit of energy (1 eV = 1.602 * 10^-19 J, 1 MeV = 1.602 * 10^-13 J). Since the unit of momentum is an energy unit divided by a velocity unit, nuclear physicists usually specify momenta of nuclei in units of MeV/c, where c is the speed of light (c = 2.998 * 10^8 m/s). In the same units, the mass of a proton (1.673 · 10^-27 kg) is given as 938.3 MeV/c^2. If a proton moves with a speed of 15,724 km/s, what is its momentum in units of MeV/c?