Question

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

Answer 1

Time taken = 2 min 20 sec = 140 sec.

Radius, r = 100 m

Time to complete one round = 40 sec

So, Round completed in 140 sec = 140 ÷ 40 = 3.5 (three and a half) round.  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.

Answer 2

Explanation:

displacement=diameter=200m