Duration: 7:41

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Two identical uniform discs roll without slipping on two different surfaces \( \mathrm{AB} \) and \( \mathrm{CD} \) (see figure) starting at \( \mathrm{A} \) and \( \mathrm{C} \) with linear speeds \( \mathrm{v}_{1} \) and \( \mathrm{v}_{2} \), respectively, and always remain in contact with the surfaces. If they reach \( B \) and D with the same linear speed and \( v_{1}=3 \mathrm{~m} / \mathrm{s} \), then \( v_{2} \) in \( \mathrm{m} / \mathrm{s} \) is
\( \mathrm{P} \) \( \left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)

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