Seymour stands on Earth, and Sophie moves away from him in a rocket, at 299,000

Question

Seymour stands on Earth, and Sophie moves away from him in a rocket, at 299,000 km/s (1000 km/s shy of light speed.) Seymour shines a laser beam towards Sophie. As the tip of the beam passes her rocket, SEYMOUR observes (read all selections before answering)

BOTH the beam moving just 1000 km/s faster than Sophie AND the beam moving at 300,000 km/s

ONLY The beam moving away at 300,000 km/s

ONLY The beam moving 300,000 km/s faster than Sophie

All of these choices are correct

ONLY The beam moving faster than Sophie by 1000 km/s

BOTH the beam moving just 1000 km/s faster than Sophie AND the beam moving at 300,000 km/s

ONLY The beam moving away at 300,000 km/s

ONLY The beam moving 300,000 km/s faster than Sophie

All of these choices are correct

ONLY The beam moving faster than Sophie by 1000 km/s

Explanation / Answer

1. BOTH the beam moving just 1000 km/s faster than Sophie AND the beam moving at 300,000 km/s

reasoning: We sure the speed of light is always constat so this is correct undoubtedly: the beam moving at 300,000 km/s

The speed of light foe ALL observers and ALWAYS is 300,000 km/s.

And we know that the spped of the Suphie is 299000 km/s and the speed of the beam is 300000km/s, so the beam moving just 1000 km/s faster than Sophie

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