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 3mg/k, where m is mass of block, g is acceleration due to gravity and K is spring constant.
(A) Acceleration of block just after it is released is 4g/3
(B) The tension in the string connecting mass m, just after the system is released is mg.
(C) The tension in the string connecting mass m, just after the system is released is 3mg.
(D) The tension in the string connecting mass m, just after the system is released is 7mg/3
