gc textbook chapter 8 Rotational Motion (id: edef5090c)

[问答题]
A large spool of roppw.)jxsyka*(: (az i xe rolls on the ground with the end of the 7+r )y,/srwfjf8 ro8ftmzu0g5sv k+ d 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 m5rg7)fy 8 jr,fdkorsvu/ sftw ++8z0of rope unwinds from the spool? How far does the spool’s center of mass move?

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