Question

In a race, the circular track is 2 km long. An athlete covers 10 laps in 8 minutes. What is the velocity of the athlete?

Answer 1

Answer:

hope the pic will help you

Answer 2

Answer:

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 = 140/40 = 3.5

⇒ Distance covered = 3.5 × circumference

⇒ Distance covered = 3.5 × 2 × 22/7 × 100

⇒ Distance covered = 5 × 2 × 22 × 100

⇒ Distance covered = 2200 m

Hence, the distance covered at the end of 2 min 20 seconds is 2200 m.

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

Explanation: