The total energy of a particle is 3.97 times its rest energy. The mass of the particle is 2.8 × 10^-27 kg. The speed of light is 2.99792 × 10^8 m/s and 1 J = 6.242 × 10^12 MeV .
With what speed is the particle moving and what is the particle's momentum? Answer in units of MeV/c for A. Answer in units of m/s for B.