To start a lawn mower, you must pull on a rope wound around theperimeter of a flywheel. After you pull the rope for 0.87 s, the flywheel is rotating at 5.4 revolutions per second, at which point the ropedisengages. This attempt at starting the mower does not work,however, and the flywheel slows, coming to rest 0.24 s after thedisengagement. Assume constant acceleration during both spin up andspin down.

(a) Determine the average angular accelerationduring the 0.87-s spin-up and again duringthe 0.24-s spin-down.

spin-up (in rad/s2)

spin-down (in rad/s2)

(b) What is the maximum angular speed reached by the flywheel?

(in rad/s)

(c) Determine the ratio of the number of revolutions made duringspin-up to the number made during spin-down.