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Mechanics, rotation, angular deceleration. Part 2

This question is posted in three parts this is part 2

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initial rotaional speed
wo = 800 rpm = 800/60 rps = 2*pi*40/3 rad/s = 80*pi/3 rad/s
Final rotational speed,
wf = 0
time t = 6 s
angular acceleration alpha = ?
wf = wo + alpha*t
=> alpha = - ...

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