This is an example of a question that demands the use of your noodle (that's your brain) - specifically, your common sense and your mathematical sense. The velocity of a car at 1-second intervals of time is stated. Clearly, the velocity values are changing. According to the definition in the Define Help section, this car must be accelerating. A more careful investigation shows that the velocity is not only changing but changing by the same amount each second. If accelerating objects are changing their velocity, then objects with a constant rate of acceleration are changing their velocity by the same amount each second in time. That is what this object is doing.
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