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A lever PQ, hinged at P, of mass 'm' and...

A lever PQ, hinged at P, of mass 'm' and length 'l' lies on the drum ( solid cylinder ) of mass 'm' and radius 'R'.The drum can rotate about the horizontal axis passing through O. The coefficient of friction between the lever and drum is `1//4`. A block of mass 'm' is connected through the string with the drum as shown in the figure. The string does not slip on the drum. Then the acceleration of the block is

A

`g//3`

B

`g//2`

C

`g//4`

D

zero

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The correct Answer is:
A
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