an athlete can complete one round of a track of radius in 40 seconds his displacement after 2 minutes 20 seconds will be
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Radius is r. Circumference is = 2 pi r.
Time is 40 s.
Every 40 seconds he comes back to original position l. So in 140 s he would cover 3 and half circles. Hence
Total distance is 2r pi x 3.5 = 7r pi.
Total displacement will be = 2r since ball will be directly across the diameter .
Time is 40 s.
Every 40 seconds he comes back to original position l. So in 140 s he would cover 3 and half circles. Hence
Total distance is 2r pi x 3.5 = 7r pi.
Total displacement will be = 2r since ball will be directly across the diameter .
liza38:
thnks
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well since the field is circular, the athlete would start from a point and then complete the run, that is, he would finish the path. The distance travelled would be something obviously but the displacement would be zero since the athlete would end up at the same point from he started .
Hope it clears your confusion.
Hope it clears your confusion.
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