[问答题]
A large spool of rope ffmp(n2, g)gd rolln 6lz;lz 619 lutbtj)ms on the ground with the end of the rope lying on the top edge6;nltm1zl)ub zl6tj 9 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 the spool? How far does the spool’s center of mass move?
