4. (25%) In the Figure on the right, blocks A, B ' and C are made of wood and are on a rough cement surface whose Friction coefficients are: 0.3 and 0.2. The masses of the blocks are: M1=3kg, MB-ZKg and Mcl kg. The rope that connects them is light and the pulleys have negligible mass and do not offer any friction. The angle of . . inclination of the surface on which block A is located is 53\" and that of the inclined i surface on which block C is located is 37. BlockA slides down the inclined plane about 0.3 meters. The tension on blockA is 14.0 N. For block A: m _ ~_'_ .- a) Calculate the work done by the tension. b) Calculate the work done by the weight. . c) Calculate the work done by the normal. d) Calculate the work done by friction. e)I Which of the works were negative? Will it always be like this? Explain your