KCET 2011 Physics Solved Paper

Block A of mass 2‌kg is placed over block B of mass 8‌kg. The combination is placed over a rough horizontal surface. Coefficient of friction between B and the floor is 0.5 . Coefficient of friction between A and B is 0.4 . A horizontal force of 10N is applied on block B. The force of friction between A and B is
(g=10ms−2)‌. ‌