Question

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

Answer 1

Circumference of the circle = 2πr

Diameter = 200 m
Radius = 100 m

Distance covered in 1 round[ 40 sec ] = 2 × 22/7 × 100 = 628.57 m

Distance covered in 1 sec = 628.57 ÷ 40 = 15.71 m

2min 20 sec = 140 sec
Distance covered in 140 sec = 15.71 × 140 = 2199.4 m