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A disk with a radius of r = 42 cm rotating about its central axis with a frequency of 20
Hz. Suddenly at a time to which we choose to be to = 0 s, a force is applied to the wheel
such that it gives the wheel an angular acceleration of a = -2 rad/s, thereby slowing it down.
(a) What is the translational speed of the disk after 30 seconds?
(b) What is the time required for the disk to come to rest?

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