Two Spaceships, Each 100 M Long in Its Own Rest

question 73

Multiple Choice

Two spaceships, each 100 m long in its own rest frame, approach Earth from opposite directions, each with a speed 0.50c relative to Earth. As measured by a passenger in one of the spaceships,
How long is the other spaceship?

• A) 70 m
• B) 60 m
• C) 80 m
• D) 50 m
• E) 90 m