A cord is wrapped on a pulley (disk) of ...

A cord is wrapped on a pulley (disk) of mass M and radius R as shown in figure. To one end of the cord, a block of mass M is connected as shown and to other end in (a) a force of 2 Mg and in (b) a block of mass 2 M. Let angular acceleration of the disk in (a) and (b) is `alpha_(A) and alpha_(B)` respectively, then (cord is not slipping on the pulley)

`alpha_(A) = alpha_(B)`

`alpha_(A) gt alpha_(B)`

`alpha_(A) lt alpha_(B)`

None of these

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