hey varun,

i solved this using ur equations but i am not getting the answer.

once u try urself,,,,

i didnot understand the first equation    f+T=MA,

becos for the right disc which is rotating with an  angular velocity w ,  the friction acts in the forward direction(i.e, rightward)  and the tension is acting along the string (leftward)......and  hence the equation comes to be

         f - T= MA