54. A solid sphere and a disc of same mass and radius starts rolling down a rough inclined plane, from the same height the ratio of the time taken in the two cases is
(a) 15 : 14
(b) √15:√14
(c) 14 : 15
(d) √14:√15
Ans. d
(8)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)