Looping

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 $$g$$.

Knowing that $$h = 3R$$, calculate the normal reaction at point $$C$$.

Ignore friction.

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