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.
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The athlete needs to change his speed at the corners to keep himself on the track while changing direction.
The athlete runs at a uniform speed on the straight parts of the track (AB, BC, CD, and DA), but he quickly changes his speed at the corners.
The athlete changes his direction of motion four times while completing one round on the rectangular track.
An example of this situation is a car driving around a circular track at a constant speed. Although the speed (magnitude of velocity) remains the same, the direction of the car’s motion is continuously changing, resulting in acceleration.