Question

An athlete completes one round safe circular track of dia. 200m in 40s. Find distance and displacement at the the end of 2 minutes 20seconds

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
hope it help u

Answer 2

Distance =200m
In 40s----------200m
So,
In 1 s----------200/40=>5m/s

And in 2min 20sec(or 140s)
In 1s-------5m/s
So,
In 140s---------140×5=>700m/s







And displacement is zero since athlete came at the same distance from where he started