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Two blocks A and B of masses 3 kg and 6 ...

Two blocks A and B of masses 3 kg and 6 kg are connected by a massless spring of force constant `"1800 N m"^(-1)` and then they are placed on a smooth horizontal surface. The blocks are pulled apart to stretch the spring by 5 cm and then released. What is the relative velocity (in `ms^(-1)`) of the blocks when the spring comes to its natural length?

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