Spaceship A, traveling past us at 0.7c, sends a message capsule to spaceship B, which is in front of A and is traveling in the same direction as A at 0.8c relative to us.The capsule travels at 0.95c relative to us.A clock that measures the proper time between the sending and receiving of the capsule travels:
A)in the same direction as the spaceships at 0.7c relative to us
B)in the opposite direction from the spaceships at 0.7c relative to us
C)in the same direction as the spaceships at 0.8c relative to us
D)in the same direction as the spaceships at 0.95c relative to us
E)in the opposite direction from the spaceships at 0.95c relative to us

Question

Quizplus · Accepted Answer

The proper time is measured in the frame where the events occur at the same location, which is the frame of the capsule traveling at 0.95c relative to us.

Spaceship A, Traveling Past Us at 0