[问答题]
A large spool of rope rolls on the g,qhyeck .da/ eb0xm8*b8zr4v round with the end of the rope lying on my+ j*;8ohogeajb j2 9the top edge of the spool. A person grabs the end of the rope and walks a distance L, holding onto it, Figmjo *j;gj2yheb+ a o89. 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?