Posted by **Sian** on Tuesday, November 27, 2012 at 9:53pm.

A string is wound around a solid cylindrical spool of mass 9.7 kg and radius 0.1 m and is tied to the ceiling. If the spool is released from rest and rolls on the string, and the distance to the ﬂoor is 6.14 m, how long will it take the spool to hit the ﬂoor?

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