A particle is moving in a circle in vertical plane about a horizont...

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A particle is moving in a circle in vertical plane about a horizontal axis \( A B \) with help of two
\( \mathrm{P} \) massless strings of length \( 10 \mathrm{~m} \) each as shown

W in figure. The minimum possible speed of particle during that motion is \( \left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
(1) \( 5 \mathrm{~m} / \mathrm{s} \)
(2) \( 5 \sqrt{2} \mathrm{~m} / \mathrm{s} \)
(3) \( 10 \mathrm{~m} / \mathrm{s} \)
(4) \( 7 \mathrm{~m} / \mathrm{s} \)
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