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Sir, please explain it.
As there is no external torque present here,the angular momentum is conserved.
or, Angular momentum=(moment of inertia)*(angular velocity)=constant
So,as liquid got spread out mass getting farther from center increases the overall moment of inertia.Hence the decrease inangular velocity first ,but then liquid falling through perimeter of disk again decreases the moment of inertia until it become same as before asbefore pouring of liquid.Thus the angular velocity increases for that time to be the previous value.
Therefore the decrease initially & then increase again in the value of angular velocity.
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