Question

An athlete completes one round of a circular track of diameter 200 m in 40 seconds. What will be the

distance covered and displacement at the end of 2 min 20 sec?​

Answer 1

Given :-

Diameter of circular track = 200 m

Radius, r = 200/2

= 100 m

Time taken by athlete to complete one round = 40 seconds.

To Find :-

Distance covered = ??

Displacement = ??

Formula to be used :-

Speed = Distance/Time

Circumference of circle = 2πr

Solution :-

2 min 20 seconds = 140 seconds

Number of rounds = 140/4 = 35

⇒ Distance covered = 35 × circumference

⇒ Distance covered = 35 × 2 × 22/7 × 100

⇒ Distance covered = 5 × 2 × 22 × 100

⇒ Distance covered = 22000 m

Hence,

the distance covered at the end of 2 min 20 seconds is 22000 m or 22 km.

And displacement is 200 m as it return to initial position again.

Answer 2

Answer:

Distance covered = 8800m

Displacement = 200m

Explanation:

Please see the attached image.

Hope it helps you

Thanks