A wedge of mass \( M \) can slide on two parallel rails A and B inclined at an angle \( \theta \) to the horizontal. In the middle of the rails and parallel to them runs a frictionless rod \( \mathrm{C} \) that wears a light ring \( D \). The rod does not touch the wedge. A light inextensible cord attached with the ring runs through a hole in the wedge without touching it, then runs round an ideal pulley on the top of the wedge and finally attached to a block of mass \( m \) that can slide along the vertical face of the wedge without friction as shown in the figure. Coefficient of friction between the wedge and the rails is \( \mu \). Initially the system is held motionless and then released. Find the acceleration of the block. Acceleration due to gravity is \( g \).
\( \mathrm{P} \)
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