A 4. 08 kg block is lowered down a 36. 5º incline a distance of 4. 30 m from point A to point B. A horizontal force (F = 8. 64 N) is applied to the block between A and B as shown in the figure below. The kinetic energy of the block at A is 11. 12 J and at B is 21. 0 J. How much work is done on the block by the force of friction between A and B?.
