A girl sitting on a spinning bus tool with her legs folded , suddenly out spreads then her angular velocity will:

Explanation

The moment of inertia of girl increases (since the mass of her legs is now farther from the axis of rotation). According to the law of conservation of angular momentum, the product of the moment of inertia and the angular velocity must remain constant. If the moment of inertia increases, the angular velocity must decrease in order to keep the total angular momentum constant. So the correct answer is (A) decrease.