Uniform circular motion is the motion of an object moving in a circular path with a uniform speed.
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The motion of the athlete along a circular path is considered an example of accelerated motion because, even though the magnitude of his velocity remains constant, there is a continuous change in the direction of his motion.
As the number of sides increases, the length of each side of the track decreases to a point.
As the number of sides of the track increases, the athlete has to take turns more and more often.
The track the athlete runs on is rectangular, with four straight parts (AB, BC, CD, and DA). The athlete changes direction at the corners to stay on track.