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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

(50)

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