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A body completes one round of a circle o...

A body completes one round of a circle of radius `R` in 20 second. The displacement of the body after 45 seconds is

A

`(R )/(sqrt(2))`

B

`sqrt(2)R`

C

`2sqrt(R )`

D

`2R`

Text Solution

Verified by Experts

The correct Answer is:
B
In 40 sec body completes two revolutions.
In 5 sec it covers 1//4 th of the circle and angle traced is `(pi)/(2)`. So displacement `s = 2R sin (theta)/(2)`
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