in figure. A block of weight \( 1000 N \) rests on the inclined plane \( BC \) and is tied by a rope passing over a Pulley to a block weighing W Newtons and resting on the plane AC. if the coefficient of friction between the block and plane BC is \( 0.28 \) and that between the block and the plane \( AC \) is \( 0.20 \), find the least and the greatest value of W for the equilibrium of the system.
