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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