18. A fan initially rotates clockwise at 9.0 rad/s, but has a counterclockwise angularacceleration of 3.0 rad/s? and reaches a counterclockwise angular speed of 27 rad/s.How much time did this change in the angular velocity take?a. -9 sb. -12 sc. 9 sd. 12 s19. A carnival ride initially rotates counterclockwise at 2.0 rad/s, but comes to rest with aconstant acceleration over an angular displacement of 6.0 rad. What is the angularacceleration?a. -9 rad/s2b. -0.33 rad/s?c. 9 rad/s?d. 0.33 rad/s²

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18. A fan initially rotates clockwise at 9.0 rad/s, but has a counterclockwise angular acceleration of 3.0 rad/s? and reaches a counterclockwise angular speed of 27 rad/s. How much time did this change in the angular velocity take? a. -9 s b. -12 s C. 9 s d. 12 s