Duration: 10:03

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