# Mechanics, rotation, angular deceleration. Part 2

This question is posted in three parts this is part 2

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#### Solution Preview

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 = - ...

$2.19