A heavy disc 4 of mass my and radius R is on a horizontal surface, on which it always rolls without slipping. A block B of mass ma is on a surface inclined at an angle relative to horizontal, and is connected to the dise A by means of the pulley arrangement shown in Figure 1. The pulleys are all massless and frictionless, and the strings are all massless and inextensible. Both the dise A and the block B are made from the same material, and the coefficient of kinetic friction between that material and the surface is me. The acceleration due to gravity is g and acts downward in the figure. Note that the moment of inertial of the dise about its centre of mass is given by the expression Izzje = a) Show that, if the disc rolls on the plate without slipping