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Mohan Sharma
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Asked: 2025-02-06T09:05:52+00:00 In:

An athlete complete one round of a circular track of radius R in 40 seconds. What will be his displacement at the end of 2 min 20 s?

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Poll Results

28.57%(a) Zero ( 2 voters )
28.57%(b) 2R ( 2 voters )
28.57%(c) 2πR ( 2 voters )
14.29%(d) 7πR ( 1 voter )
Based On 7 Votes

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The athlete completes one round of the circular track in 40 seconds.
Total time given = 2 minutes 20 seconds = 140 seconds
Number of rounds completed = 140 ÷ 40 = 3.5 rounds
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.

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    1. (b) As the athlete completes one round of a circular track in 40 s, hence in 2 min 20 s (or 140s) he will complete 7/2 rounds. Thus as shown in figure if he starts running from point A then on completion of 7/2 round he will be at point B. Thus, net displacement of the athlete AB = 2R.

      https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-7/

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