[问答题]
A large spool of rope rolls on the +rl2ddt0 w-xs gro5q.kxgye* x qf,e2)+a v/imj04catb vund with the end of the rope lying on the top edge of the spool. A person grabs the end of the rope and walks a distance L, holding onto it, Fig. 8–50. The spool rolls behind the person without fq,eaq+xx/02 4ac te. vy jig5)*vb mkslipping. What length of rope unwinds from the spool? How far does the spool’s center of mass move?