A 2.03 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.502 and the coefficient of kinetic friction is 0.273. How much force is needed to begin moving the book? N How much force is needed to keep the book moving at constant speed once it begins moving? NAn Atwood machine consists of two masses hanging from the ends of a rope that passes over a pulley. The masses have the values m. = 29.0 kg and m; = 12.0 kg. Assume that the rope and pulley are massless and that there is no friction in the pulley. What is the magnitude of the masses' acceleration :1? ES