An observer on earths sees spaceship 1 fly at 0.80c. 9 years later according to the observer on earth, spaceship 2 flies by earth at 0.80c, 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)7.2
b)10
c)12
d)15
e)20
an observer in spaceship 1 observes spaceship 2 to be light-years away.
a)7.2
b)10
c)12
d)16
e)20