A) \[\frac{\pi }{2}\]
B) \[\frac{\pi }{4}\]
C) \[\frac{\pi }{6}\]
D) \[\frac{\pi }{8}\]
Correct Answer: A
Solution :
Angular retardation, \[\alpha =\frac{{{\omega }_{2}}-{{\omega }_{1}}}{t}=\frac{2\pi ({{n}_{2}}-{{n}_{1}})}{t}\] \[=\frac{2\pi (0-900/60)}{60}=\frac{\pi }{2}rad/{{s}^{2}}\]
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