You are in a spaceship with no windows, radios, or other means to check outside. How would you determine if the spaceship is at rest or moving at constant velocity?   a) By determining the apparent velocity of light in the spaceship   b) By checking your precision watch. If it's running slow, then the ship is moving.   c) By measuring the lengths of objects. in the spaceship. If they are shorter, then the ship is moving.

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