A thin horizontal circular disc is rotating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, the angular speed of the disc:
(1) continuously decreases (2) continuously increases
(3) first increases and then decreases (4) remains unchanged
I think it should be continuosly decreases as in this we have to conserve angular momentum
And insect moves its moment of inertia increases so angular speed decreases .
But the answer is given as option 3