Question

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

Answer 1

Diameter= 200 m.

Start position point A. (See fig.).

Completes round in 40 sec.

Circumference = pi * 200 m covered in 40 sec.

In 2 min 20 sec. that is in 140 sec., he will complete 140/40 = 3 & half rounds.

He will be at point B.

Total distance covered will be

3 and half times Circumference

= 7/2 * 200 * 22/7 = 2200 m.

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Answer 2

▶Distance covered in one round= ▶Circumference of the circle

▶Circumference of the circle=> 2πr

Diameter=> 200m
Radius=> 100m

▶Distance covered in one round=> (40 sec)= 2×22/7×100=> 628.57m

▶Distance covered in 1 sec=> 628.57✖40= 15.71m

▶2min 20 sec=> 140 sec

▶Distance covered in 140 sec= 15.71m

▶15.71m✖140=> 2199.4m Ans...