Question

I want step by step explanation​

Answer 1

Answer:

Displacement is the shortest distance possible between initial and final position.

As the athlete is in circular motion , displacement is zero. [ THis is because , the initial and final position is the same ]

Distance covered in 1 round = Circumference of the circle

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

Answer 2

Answer:

track distance=200m

time taken by athlete=40sec

time given=2m20sec. (1m=60sec)

=(2*60+20)sec

=140sec

so,times he make revolution=time given/time taken by

athlete

=140/40

=3.5 or 3and1/2

so distance covered by athlete=track distance*times

athlete make revolution

=200*3.5m

=650m

so, distance covered by athlete is650m.