[问答题]
A large spool of rope rolls on the ground with t)nt.vs*q upm *-/lmqp xsf.p /b1f kw1he 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 slipping. What length mwf1l / -qp1pkfsx b/.of rope unwinds from the spool? How far does the spool’s center of mass move?
