Competitive divers pull their limbs in and curl up their bodies when they do somersaults. just before entering the water, they fully extend their limbs to enter straight down. how does their angular velocity change when they fully extend their limbs?

The angular velocity is reduced when the body is fully stretched.

Explanation:

Divers keep there bodies as compact as possible just to increase the angular velocity.

When they extend their limbs to enter straight down the angular momentum helps them to dive. The angular velocity is reduced when the body is fully stretched and diver's inertia is also not reduced. Thus a streamlined shape is formed which helps to penetrate more deeper into the water.

The impact area is reduced when fully stretched body is entered in to the water.

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