Let's explore propelling a small spaceship with a mass of 10 kg. The ship emits photons from its thrusters, whose total momentum propels it forward.

a) What is the conservation principle applied here?
b) Calculate the momentum of the emitted photons if the spaceship accelerates at 2 m/s^2.
c) How does the spaceship's mass affect its acceleration?
d) Discuss the energy implications of this propulsion method.