A) \[\pi /2\]
B) \[\pi /4\]
C) \[\pi /6\]
D) \[\pi /8\]
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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