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Passage VIII A disc of mass m and radius...

Passage VIII A disc of mass m and radius R is attached with a spring of force contant k at its center as shown in figure. At x-0, spring is unstretched. The disc is moved to x=A and then released. There is no slipping between disc and ground. Let f be the force of friction on the disc from the ground.

f versus t (time) graph will be as

A

B

C

D

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The correct Answer is:
C
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