A light string 4.0 m long is wound around a cylindrical spool of mass 1.0 kg and radius 0.5 m. The spool, initially at rest, is mounted on a frictionless axle. The string is pulled from the spool with a constant acceleration of magnitude 2.5 m/s2. (a) How much work has been done on the spool when it reaches an angular speed of 8.0 rad/s? (b) How long does it take the spool to reach this angular speed? (c) How much string is left on the spool when it reaches this angular speed?

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