The displacement of the athlete will be zero when she returns to the starting point O. In that case, she travels 100 m from O to A and 100 m back to O. Total distance = 200 m.
In the example of an athlete running back and forth on a straight track (Fig. 4.4), when will the displacement of the athlete be zero? What will be the total distance travelled in that case?
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The displacement of the athlete will be zero when she returns to her starting point O, because her initial and final positions are the same. She runs from O to A, covering 100 m and then returns from A to O, covering another 100 m. Therefore, the total distance travelled is 100 + 100 = 200 m, while the displacement is 0 m.
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