149. A massless string is wrapped round a disc of mass M and radius R. Another end is tied to a mass m which is initially at height h from ground level as shown in the fig. If the mass is released then its velocity while touching the ground level will be
(a) √(2gh)
(b) √(2gh)M/m
(c) √(2ghm/M)
(d) √(4mgh/2m+M)
Ans. d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a