Solutions to 2B.4

4) The velocity of the electron: v_e' = 0.918562. The velocity of the proton: v_p' = -0.001266
5) Electron: E = 8.9735e-30 [kg], p = 8.92714e-30 [kg]. Proton: E = 3.58845e-27 [kg], p = 3.17479e-27 [kg]
6) The velocity of the electron: v_e = 0.994834. The velocity of the proton: v_p = 0.884725