# Mechanics 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 $\alpha$ then relation between al, a2and $\alpha$ will be ​

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