The 20 kg paper roll has a radius of rotation KA = 90 mm with respect to an axis passing through the fixed point A. The roll is held by a bar AB. The coefficient of kinetic friction between the coil and the wall surface is equal to 0.2. At a given instant, a vertical force F = 30 N is applied at the end of the paper, as shown in Figure 5. The moment of inertia of the coil is calculated from the equation 10=mKA2. The acceleration of gravity is assumed to be 9.81m/s2. (1.5 pts) Calculate: (a) The magnitude of the angular acceleration of the roll when the paper unrolls. b) How many meters of paper have been unrolled after 3 seconds. 300 mm B C 125 mm