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145. A disc of mass M and radius R rolls in a horizontal surface and then rolls up an inclined plane as shown in the fig. If the velocity of the disc is v, the height to which the disc will rise will be

(a)     3v2/ 2g

(b)    3v2/4g

(c)     v2/4g

(d)    v2/2g

Ans. b

 

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