[问答题]
A large spool of rope rolls on the
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k6 /uh:ejy o )k1s9dtj/ qrt.qetd,+g nd 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 slipping. What length of rope unwinds from the spo
69yt1j)+ g:etrtsdq kuko,q//de j. hol? How far does the spool’s center of mass move?
