Question

1. An athlete completes one round of a circular track of diameter
200 m in 40 s. What will be the distance covered and
displacement at the end of 2 minutes 20 s?
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Answer 1

Answer: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.

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Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation

speed=200/40=5m/s

distance =5*140sec=700m

displacement= 0