[问答题]
A large spool of rope roll3kcf 1-l rccz*jecl4z 1b0m.wsbv6pu w .j41is on the ground with the end of the rope lying on the top edge of the spool. A person grabs the end of the z1. w4wuv1s4mcp ei60l.jjbb 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?