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The natural frequency of a simply supported beam of length l with mass M at its centre , flexual rigidity EI and negligable beam mass is
$$\frac{1}{2 \pi} \sqrt{\frac{48EI}{ml^{3}}}$$
$$\frac{1}{2 \pi} \sqrt{\frac{3EI}{ml^{3}}}$$
$$\frac{1}{2 \pi} \sqrt{\frac{EI}{ml^{3}}}$$
None of the above
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