144. A ring of radius 4a is rigidly fixed in vertical position on a table. A small disc of mass m and radius a is released as shown in the fig. When the disc rolls down, without slipping, to the lowest point of the ring, then its speed will be
(a) √ga
(b) √2ga
(c) √3ga
(d) √4ga
Ans. d
(149)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)