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Question

A player completes a circular path of radius r in 40s. At the end of 2 minutes 20 seconds, its displacement will be

A
2r
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B
2πr
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C
7πr
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D
Zero
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Solution

The correct option is A 2r
The player completes one complete revolution in 40 s.
Time taken t=2 min 20 sec=2×60+20=140 s
Thus in this time, the player completes 14040=3.5 revolutions
After this time, he reaches at the diametrically opposite end. Thus his displacement is equal to the diameter of the circular path i.e. 2r

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