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If the speedometer on a car indicates a constant speed can you be sure the car is not acclerating

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No, you cannot be sure.

'Acceleration' is any change in the speed or direction of motion.
If the car is driving around a curve and the speedometer indicates
a constant speed, it's still accelerating, because its direction is
constantly changing as long as it's on the curve.
User Adan Cortes
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