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A computer hard disk starts from rest, then speeds up with an angular acceleration of 210...

A computer hard disk starts from rest, then speeds up with an angular acceleration of 210 rad/ s^2 for 5.0 s until it reaches its final angular speed. It rotates for another 6.0 s at that constant angular speed. It then slows down and comes to rest in 9.0 s.
A. determine the angular speed of the disk 5.0 s after start up. Express your answer in rad/s and rpm (rev/min).
B. determine the angular speed of the disk 11.0 s after start up.
C. determine the angular acceleration of the disk when it was slowing down.
D. determine the number of revolutions made by the disk in the 20 s it was spinning.
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