How can concepts and categories help you write an essay?
They help you develop required symbolism.
Concepts and categories help you organize your ideas into paragraphs and sentences.
They will help you create mental images.
Concepts and categories help you recover lost memories

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Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

So are u adding some additional catalyst