calculate the angular acceleration and the angular velocity of a 2kg mass object rotating in a circle of 1.5m in a time of 3 seconds,

1) pi x 3 = 9.42m

2) theta=distance/radius= 9.42/1.5= 6.28 rads

3)w= theta/time= 6.28/3= 2.09 rads/s (ANGULAR VELOCITY)

4)w2*radius= 2.09*1.5= 6.579 rad/s2 (ANGULAR ACCELERATION)

could somebody tell me if i,ve got any of this right,and should i have included the mass of the object somewere in the working out,

,, thanks for any input,,