A man is pushing a 77kg sofa across an inclined floor (angle of inclination is 18 degrees). If the coefficient of kinetic friction between the sofa feet and the floor is 0.37, what is the magnitude of the sofa's acceleration if the man's push (parallel to the floor) shown in the figure is - 925N?

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A: m1=F1g=80,0009.81=8163.2kgm2=F2g=120,0009.81=12,244.8kg