A block A slides over an another block B...

A block A slides over an another block B which is placed over a smooth inclined plane as shown in figure . The coefficient of friction between the two blocks A and B is `mu` . Mass of block B is two times the mass of block A . The acceleration of the centre of mass of two blocks is

g sin `theta`

`(g "sin" theta - mu g "cos" theta)/(3)`

`( g "sin" theta)/(3)`

`( 2 g "sin" theta - mu g "cos" theta)/(3)`

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