Physics

So the question I am doing has multiple parts. I was wondering how I should solve this and what formulas should be used.
A grinding wheel of radius (.30cm) and mass 15 kg is spinning at a rate of 20.0 revolutions per second. When the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest. (Moment of inertia of a grinding wheel: 1/2 mr^2).
a. What was the initial angular velocity of the grinding wheel?
b. What was the angular acceleration of the grinding wheel as it came to rest?
c. How many rotations did the wheel make during the time it was coming to rest?
d. What was the angular momentum of the wheel initially?

Please Help Me.

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  1. a. 20rpm/sec * 2PI rad/rev * 1min/60sec
    b. accelerlation= (wf-wi)/time= (0-wfAbove)/80 rad/sec^2
    c. rotations= avgspeed*time=10rpm*1min/60sec * 80sec
    d. angmmentum=1/2 Mass*.06^2 (radius is in meters)

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