Question

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

Answer 1

Answer:

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Explanation:

Given that,  

The diameter of the circular track = 200 m  

Radius, r = 200/2 = 100 m  

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

Distance covered = ??  

Displacement = ??  

Speed = Distance/Time  

Circumference of circle = 2πr

Solution :-  

2 min 20 seconds = 140 seconds

Number of rounds completed in 140s = 140/40 = 35

= Distance covered = 3.5 × circumference

= Distance covered = 3.5 × 2 × 3.14 × 100

= Distance covered = 2200 m

Hence, the distance covered at the end of 2 min 20 seconds is 2200 m or 22 km. And displacement is 200 m as it returns to the initial position