Two spacecrafts A and B are moving relative to each other at a constant velocity

Question

Two spacecrafts A and B are moving relative to each other at a constant velocity. Observers in spacecraft A see spacecraft B. Likewise, observers in spacecraft B see spacecraft A. Who sees the proper length of either spacecraft?


A. Observers in neither spacecraft see the proper length of the other spacecraft.
B. Observers in both spacecrafts see the proper length of the other spacecraft.
C. Observers in spacecraft B see the proper length of spacecraft A.
D. Observers in spacecraft A see the proper length of spacecraft B.

Explanation / Answer

If they are both moving at the same velocity but towards each other, then with respect to each spacecraft, the other is moving twice the speed. this means they see the same but incorrect length length, hence A is correct. An observer in a fixed frame not moving with the spacecrafts would also see an incorrect length but this length will be different from as seen form the spacecraft

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