1.

An athlete completes a circular path of radius 'r'in40s. Find his displacement at the end of2 minutes 20seconds9.What dThe can

Answer»

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



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