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The angular acceleration of a wheel is a - 9.0t4 - 7.0t2, with a in radians per second-squared and t in seconds. At time t - 0, the wheel has an angular velocity of +3 rad/s and an angular position of +9 rad. Write expressions for (a) the angular velocity (rad/s) and (b) the angular position (rad) as functions of time (s). (a) Number i i 13+ i Units (b) Number i i 14+ i t+ i Units