Answer:
The correct answer is option 'c': [tex]1.6rad/s^{2}[/tex]
Explanation:
By definition of angular acceleration we have
[tex]\alpha =\frac{\omega _{f}-\omega _{i}}{t_{f}-t_{i}}[/tex]
where,
[tex]\omega _{f}[/tex] is the final angular velocity
[tex]\omega _{i}[/tex] is the initial angular velocity
[tex]{t_{f}-t_{i}[/tex] is the time in which the angular velocity is changed
Applying values we get
[tex]\alpha =\frac{11-2}{5.5}\\\\\therefore \alpha =1.63rad/s^{2}[/tex]
