Question

1. An athlete completes one round of a circular track of diameter
200 m in 40 s. What will be the distance covered and the
displacement at the end of 2 minutes 20 s?​

Answer 1

Time taken = 2 min 20 sec = 140 sec.

Radius, r = 100 m.

InTime to complete one round = 40 sec

So, Round completed in 140 sec

= 140 ÷ 40 = 3.5 (three and a half) round.

Or, distance covered = 2 x 22/7 x 100 x 3.5 = 2200 m.

At the end, the athlete cavers half round and will be at a distance = diameter of circle. ie displacement = 200m.