Sliding Dumbbell

A dumbbell is constructed by fixing small balls each of mass \(6\text{ kg}\) at the ends of a light rod of length \(135 \text{ m}\). The dumbbell stands vertically in the corner formed by a friction-less floor. After the bottom end is slightly pushed to the right the dumbbell starts to slide. Acceleration due to gravity is \(10 \text{ m/s}^{2}\). Find the speed of lower ball (in \(\text{m/s}\)) when the upper ball is leaving the wall.

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