15. A flywheel gains a speed of 540 r.p.m. in 6 sec. Its angular acceleration will be
(a) 3 pi rad/sec2
(b) 9 pi rad/sec2
(c) 18 pi rad/sec2
(d) 54 pi rad/sec2
Ans. a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a