Solutions to 2B.5
1) Spaceship B velocity seen from spaceship A: v_B' = -0.547365c
8) The total energy of a photon: E = 2m*gamma/n = 3.36924e-36 kg. The wavelength in the planet frame: lambda = 656 nm
12. The wavelength in the spaceship frame: lambda' = 420 nm
14. The velocity needed: v = 0.999999999939180, you might not get exactly this number, depending on precision, but you should get a number very close to 1