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How do you know that a speedometer tells you the instantaneous speed of a car?

How do you know that a speedometer tells you the instantaneous speed of a car?
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How do you know that a speedometer tells you the instantaneous speed of a car?

User Tompee
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1 Answer

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Because the speedometer responds directly and proportionally to acceleration (whether speeding up or breaking). If the speedometer displayed average speed it would not be directly affected by changes in speed due to acceleration
User Lyzkov
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