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1. What does the equation E = mc 2 mean? 2. Suppose a person riding on top of a freight car shines a searchlight beam

1. What does the equationE =mc² mean?

2. Suppose a person riding on top of a freight car shines a searchlight beam in the direction in which the train is traveling. Compare the speed of the light beam relative to the ground when:

a. The train is at rest.

b. The train is moving.

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