Question

An athlete completes one round of a circular track of track of radius 21 m in 20 s . Calculate the distance covered and displeament at the end of 30 s
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Answer 1

Given :-

• Diameter of circular track = 42 m

• Radius, r = 42/2 = 21 m

• Time taken by athlete to complete one round = 20 seconds.

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To Find :-

• Distance covered = ?

• Displacement = ?

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Formula to be used :-

• Speed = Distance/Time

• Circumference of circle = 2πr

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Solution :-  

• Number of rounds = 30/20 = 1.5

• ⇒ Distance covered = 1.5 × circumference

• ⇒ Distance covered = 1.5 × 2 × 22/7 × 100

•  ⇒ Distance covered = 942.85 m = 943 m (Approx.)

• Hence, the distance covered at the end of 30 seconds is 943 m.

• And displacement is 42 m as it return to initial position again.

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