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Q.

An athlete completes one circle of radius r in 40 sec. What will be the displacement at the end of 2 min 20 sec?


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a

zero 

b

2R 

c

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d

None of these 

answer is B.

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Detailed Solution

Concept: The athlete to complete each quarter of the circle. Next, determine how many seconds are in the given time frame.
Look up the soonest moment the athlete resumes their starting position. The athlete's displacement may therefore be simply calculated if they travel for any additional time.
Total time duration in consideration Question ImageHe completed 1 round in Question ImageIn Question Image, he will cover Question Image rounds
After 3.5 rounds, he would be on the opposite side of the starting point So, the displacement will be the diameter or 2 R.
Hence, the correct option is  2 .
 
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An athlete completes one circle of radius r in 40 sec. What will be the displacement at the end of 2 min 20 sec?