82. A uniform disc of mass M and radius R is rotating about a horizontal axis passing through its centre with angular velocity ω. A piece of mass m breaks from the disc and flies off vertically upwards. The angular speed of the disc will be
(a) (M-2m)ω/(M-m)
(b) (M+2m)ω/(M+m)
(c) (M-2m)ω/(M+m)
(d) (M+2m)ω/(M-m)
Ans. a
(154)
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