Refer to Conceptual Example as an aid in solving this problem. An intergalactic cruiser has two types of guns: a photon cannon that fires a beam of laser light and an ion gun that shoots ions at a velocity of 0.950c relative to the cruiser. The cruiser closes in on an alien spacecraft at a velocity of 0.800c relative to this spacecraft. The captain fires both types of guns. At what velocity do the aliens see?

(a) The laser light and

(b) The ions approach them. At what velocity do the aliens see?

(c) The laser light and

(d) The ions move away from the cruiser?