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-- "Acceleration" is any change of velocity.

-- "Velocity" is a speed and its direction.

-- "20 meters per second" is a speed, not a velocity, because it doesn't mention a direction.

-- We don't have enough information to say anything about that car's acceleration.
If, for example, it happens to be moving at a constant speed of 20 meters per second
on a circular track, then it has plenty of acceleration.

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Q: What is the acceleration of a car that moves at a constant velocity of 20 meters per second?
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