Hi. I've started this problem, and have managed as far as proving the result for acceleration. If someone could finish it, or explain how to finish it so that I can finish it myself, that would be great. Thanks.

A planed is inclined at an angle arctan ¾ to the horizontal and a small, smooth, light pulley P is fixed to the top of the place. A string, APB, passes over the pulley. A particle of mass m1 is attached to the string at A and tests on the inclined place with AP parallel to a line of greatest slope in the place. A particle of mass m2, where m2 > m1, is attached to the string at B and hangs freely with BP vertical. The coefficient of friction between the particle at A and the plane is ½.

The system is released from rest with the string taut. Show that the acceleration of the particles is ((m2 – m1)g)/(m2 + m1).