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A boy completes one round of a circular ...

A boy completes one round of a circular track of radius r in 40 s. His displacement at the end of 2min 20s will be

A

Zero

B

`2pir`

C

`2` r

D

`7pir`

Text Solution

Verified by Experts

The correct Answer is:
C
Total time = `140` sec
Time for one round of a circular path = `40` sec
Then after time `140` sec he will complete half of circular path
So displacement `(D=2r)`
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