If an observer on the ground uses her own instruments to measure the speed of th

Question

If an observer on the ground uses her own instruments to measure the speed of the light in Question 7 (see below), will she obain a value less that, greater than, or equal to? Explain your answer (Question 7 - An observer on a train in the following figure stands in the back of the car. He turns on a light and measures the time it takes for the light to get to the front of the car bounce off a miorror and return to him. (Assume he is traveling in a vacuum.) Knowing the length of the car, he can calculate the speed of light.

Explanation / Answer

He obtain correct value because he is standing on the train, hence relative velocity between observer and train is zero.

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