A spaceship is observed from the Earth to be moving toward a star at a speed of 0.80 c. If the distance from the spaceship to the star is 1.6 ly as measured from Earth, how long does an observer on Earth find that it takes for the spaceship to reach the star?
A) 2.0 y
B) 2.1 y
C) 1.6 y
D) 1.2 y
E) 0.96 y

Question

Quizplus · Accepted Answer

The time taken is calculated by dividing the distance by the speed: 1.6 ly / 0.80 c = 2.0 years.

A Spaceship Is Observed from the Earth to Be Moving