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A wheel of circumference C is at rest on...

A wheel of circumference C is at rest on the ground. When the wheel rolls forward through half a revolution, then the displacement of initial point of contact will be

A

`C sqrt (1/pi^2 + 1/4)`

B

`C/2`

C

`pi sqrt(C^2 +4)`

D

`Csqrt(1/pi + 1/2)`

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