Question

An observer on Earth sees spaceship 1 fly by at 0.60c. 8 years later, the observer on Earth sees spaceship 2 fly by at 0.60c, traveling in the same direction as the first. Both spaceships continue to travel with constant velocities.

1. An observer in spaceship 1 observes Earth to pass spaceship 2 ___ years after Earth passed spaceship 1.
a) 4.8
b) 6.4
c) 8.0
d) 10
e) 12

2. An observer in spaceship 1 observes spaceship 2 to be ___ light-years away.
a) 4.8
b) 6.0
c) 7.2
d) 8.4
e) 9.6

Answer 1