# Looping II

Classical Mechanics Level pending

A sphere with mass $$m$$ is abandoned (initial velocity is 0) from point $$A$$, sliding along $$ABCDEF$$.

$$BCDE$$ is a circle with radius $$R$$.

The acceleration of gravity is equal to $$g$$.

The intensity of the force that the ball exerts on the surface at point $$D$$ is $$mg$$.

Calculate the absolute value of the angular velocity of the ball at point $$D$$.

Ignore friction.

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