A block A of mass 5 sqrt( 4) m rests on ...

A block A of mass `5 sqrt( 4) m` rests on a rough horizontal plane relative to which its coefficient of friction is `mu A` light string attached to this block passes over a light frictionless pulley and another block B of mass m hangs from it. It is observed that the block A just slips when the string makes an angle of `60^(@)` with the horizontal .
Find the coefficient of static friction between the block A and the plane. If the same force acting through the sting is applied to the block A in the horizontal direction, find the acceleration of the block A.

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The correct Answer is:

`(1)/( 9 sqrt( 3)) , ( 4)/( 45sqrt(3)) g `

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