normal force = mg - F3 - F2*sin30 = 4*9.8 - 10 - 20/2 = 19.2 N
a)
friction force = uk*N = 0.12*19.2 = 2.304 N
b)
horizontal force on block
F = F1 + F2*cos30 - friction force = 40 + 20*0.8660254 - 2.304 = 55.016 N
acceleration of the block in x axis = a = F/m = 55.016/4 = 13.75 m/s^2
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