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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

(134)

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