From a stationary position on the ground, I observe a moving boxcar which has a

Question

From a stationary position on the ground, I observe a moving boxcar which has a mirror along the front wall but it is open at the back of the boxcar. I send a flash of light from my flashlight and time the flash of light as it goes to the front of the boxcar and returns to the back of the boxcar. A passenger in the boxcar also times the round trip of the flash of light. Compare the times recorded on our watches.

A.) The time recorded on her watch is longer.
B.) The times recorded on the two watches are the same.
C.) The time recorded on her watch is shorter.
D.) The answer depends on the reference system you are in.

Explanation / Answer

C.) The time recorded on her watch is shorter.

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