Question

An athlete completes one round of a circular track of radius 10 m in 40 sec. The Displacement of the athlete in 1 min 20 sec is
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Answer 1

If athlete completes one round of a circular track of radius R in 40 seconds then after 2 m 20 sec =140 sec he would have completed 3.5 rounds that means he will be at the diametrically opposite point of starting point.

Displacement =diameter=2R

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