Calculate the ratio of (a) energy to momentum for a photon, (b) kinetic energy to momentum...

Calculate the ratio of (a) energy to momentum for a photon, (b) kinetic energy to momentum for a relativistic massive object of speed u, and (c) total energy to momentum for a relativistic massive object, (d) There is a qualitative difference between the ratio in part (a) and the other Iwo. What is it? (e) What are the ratios of kinetic and total energy to momentum for an extremely relativistic massive object, for which u  c? What about the qualitative difference now?