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They're not necessarily.

In principle, the speedometer in the car is reading the instantaneous speed. And if you ask

"How fast were you driving at 10:31:46.0298427 AM yesterday ?", the answer would be an

instantaneous speed.

But if you ask "What's your speed for your trip to the office ?", then that's a trip that includes

turning corners, stopping for red lights, crowded streets, empty streets, fast stretches, slow

stretches, accelerating and decelerating several times, and pulling into the parking space at the

office. It comprises many different instantaneous speeds, so the answer has to be the average

for the whole trip.

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Q: Why are car speeds averages?
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