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Mechanics (M1) Pulley's help!! watch

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    Hello, I need urgent help with this question.
    Two particles A and B, of mass m and 2m respectively, are attached to the ends of a light in-extensible string. The particle A lies on a rough horizontal table. the string passes over a small smooth pulley P fixed on the edge of the table. The particle B hangs freely below the pulley P. The co-efficient of friction between A and the table is mew. The particles are released from rest with the string taut. Immediately after release, the magnitude of the acceleration of A and B is 4/9g. By writing down separate equations of motions for A and B,
    a)find the tension in the string immediately after the particles begin to move
    b)show that mew=2/3
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    Hopefully this helps you out, if you are stuck on how I worked these answers out just let me know and I'll try my best to explain.
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