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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

(169)

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