A 310 g- paperback book rests on a 1200 g -textbook. A force is applied to the textbook, and the two books accelerate together from rest to 96 cm/s in 0.42 s . The textbook is then brought to a stop in 0.33 s , during which time the paperback slides off. Within what range does the coefficient of static friction between the two books lie? umin? and umax?