102. A disc of radius 1m and 4 kg mass rolls on a horizontal plane without slipping in such a way that its centre of mass moves with a speed of 10 cm/s Its rotational kinetic energy is
(a) 0.01 erg
(b) 0.02 joule
(c) 0.03 joule
(d) 0.01 joule
Ans. d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a