(5-20) Two blocks made of different materials connected together by a thin cord, slide down a plane

(5-20) Two blocks made of different materials connected together by a thin cord, slide down a plane ramp inclined at an angle to the horizontal as shown in Fig. 5-34 (block B is above block A). The masses of the blocks are mA and mB, and the coefficients of friction are uA and uB. If mA = mB = 5.0 kg, and uA =0.20 and uB=0.30, determine (a) the acceleration of the blocks and (b) the tension in the cord, for an angle .