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A uniform disc of mass m and radius R is...

A uniform disc of mass m and radius R is free to rotate about its fixed horizontal axis without friction. There is sufficient friction between the inextensible light string and disc to prevent slipping of string over disc. At the shown instant extension in light spring is `(3 mg)/K`, where m is mass of block, g is acceleration due to gravity and K is spring constant. Then select the correct alternative(s).

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