A wheel turning with angular speed of 30 rev/s is brought to rest with a constant acceleration. It turns 60 rev before it stops, the time that elapses before it stop, is
A) 2s
B) 4s
C) 5s
D) 6s
Correct Answer:
A
Solution :
Time \[=\frac{Revolution}{Angular\text{ }speed}\]\[=\frac{60}{30}=2\,s\]