A potter's wheel is spinning with an initial angular velocity of $15$ rad$/$srad$/$s$.$ It rotates through an angle of $80\mathrm{.}0$ radrad in the process of coming to rest.

Part A

What was the angular acceleration of the wheel?

Express your answer in radians per second squared.

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rad$/$s$2$rad$/$s$2$

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Part B

How long does it take for it to come to rest?