A4 kg block is lowered down an incline with an angle of 37 degrees, and a distance of 10 m from point A to point B. A horizontal force F = 9 N is applied to the block between A and B as shown in the figure. The kinetic energy of the block at A is 18 J and at B, it is 28 J. How much work is done on the block by the force of friction between A and B ? J

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