1) A disc of mass m0 rotates freely about a fixed horizontal axis through its centre. A thin cotton pad is fixed on its rim, which can absorb water. The mass of water dripping slowly onto the pad is μ per second. After what time will the angular velocity of the disc get reduced to half of its initial value.
( A )   2 m 0 μ ( B )   3 m 0 μ ( C )   m 0 μ ( D )   m 0 2 μ


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