Three identical particles are placed on a horizontal smooth table, connected with strings as sho...

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Three identical particles are placed on a horizontal smooth table, connected with strings as shown. The particle \( B \) is imparted a velocity \( v_{0}=9 \mathrm{~m} / \mathrm{s} \) in horizontal direction perpendicular to the line \( A B C \). The speed (in \( \mathrm{m} / \mathrm{s} \) ) of particle \( A \) when it is about to collide with \( C \).
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