7.  A cylinder of mass M and radius 2R has a groove of radius R. A block Of 
mass m is hung from the circumference of the cylinder and the cylinder 
itself is hung from a rigid support by a thread wound on the groove as 
shown in the figure. 
If the acceleration of centre of mass of the cylinder is 'a1' acceleration of 
the block is a2 downward and angular acceleration of the cylinder is  α
then relation between al, a2 and  α will be ‚Äč

A       a 1 - αR = a 2 B   a 1 - 2 αR = a 2 C   a 1 + a 2 = αR 2 D   a 1 - a 2 = 3 αR


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