A 4-kg block moves down a rough 37 incline a distance of 5 m from point A to point B. As shown in the figure below, a horizontal force of magnitude F = 10 N is applied to the block between these two points. The kinetic energy of the block at point A is 10 J and the kinetic energy of the block at point B is 20 J. What is the increase in internal energy of the block-incline-Earth system due to friction? A. B. C. D. E. 40 J 80 J 60 J 50 J 70 J