Question

13. A bicycle rider traveling east at 10 km/hr sees a blue car pass her appearing to travel west at 50 km/hr. What is the blue car’s apparent speed for an observer riding in a red car traveling 15 km/hr west relative to the Earth?

A. 40 km/hr

B. 15 km/hr

C. 25 km/hr

D. 35 km/hr

E. 65 km/hr

14. Kira flies her spaceship at 0.8 c, trying to catch up to her sister Aja, who’s spaceship is traveling at 0.5 c in the same direction. Kira shines a laser towards Aja’s ship to signal her imminent arrival. What is the speed of the laser light as measured by Aja?

A. 0.3 c

B. 1.0 c

C. 1.3 c

D. 1.5 c

E. 1.8 c

Answer 1