If the mass is released when the string is horizontal as shown, the magnitude of the total acceleration of the mass as a function of the angle $\theta$ is:

- $g\sin\theta$
- $2g\cos\theta$
- $2g\sin\theta$
- $g\sqrt{3\cos^2{\theta}+1}$
- $g\sqrt{3\sin^2{\theta}+1}$

Solution :

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