boy playing with a proton gun 977 a spacecraft leaves a space station and travels at a speed of 0.80 c in a direction that is 30° away from the +x direction. if a boy in the spaceship shoots a proton gun with protons having a speed of 0.5 e, what is the speed of the protons measured by the observer at rest on the space station when the gun is shot (a) toward the observer on the station? (b) toward the floor of the spaceship?