[问答题]
A large spool of rope rolls on the ground with the end of the rope lying on k41m+ vuogf2q( tud :1s;naqmdkp366 x.gwea 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 slipping. What length of rope unwinds from thak t6wna;dg1psmex 3(qu:.6 de spool? How far does the spool’s center of mass move?