Block A of mass m and block B of mass `2m` are placed on a fixed traingular wedge by means of a massless inextensible string and a frictionless pulley as shown in figure The wedge is inclined at `45^(@)`to the horizontal on both sides .The coefficient of friction between blocks A and the wedge is `2//3` and that between block B and is released from rest find the following

The acceleration of A is