- #1
Thomas2
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Consider the following situation: a car is moving away from a stationary observer with velocity V. At distance S it triggers a contact in the road which sends a light signal back to the observer from the moving car. The question is how long will it take for the signal to reach the observer ? (The time could be measured by having synchronized clocks at distance S (the trigger point) and at the observer, the former being stopped when the car passes the contact (and emits the light signal), the latter when the light signal arives at the observer; the difference of the clock readings is then the light travel time).
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