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a coin with a diameter of 2.4 cm is dropped on edge onto a horizontal surface. the coin starts out with an initial angular speed of 18 rad/s and rolls in a straight line without slipping. if the rotation slows with an angular acceleration of magnitude 1.9 rad/s^2, how far does the coin roll before coming to rest?

I know w initial is 18 rad/s and w final is 0

alpha is 1.9rad/s^2 (or is it negative??)

we're looking for theta...

I could figure it out if I had the time.. Can someone help me out?? Thanks