In the figure two blocks are connected over a pulley

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In the figure, two blocks are connected over a pulley. The mass of block A is 10.0 kg and the coefficient of kinetic friction between A and the incline is 0.20. Angle θ of the incline is 30.0°. Block A slides down the incline at constant speed. What is the mass of block B?
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For the angle of the mag force why cant we go in the reverse direction and call it -110 degrees ?

alexrodarte