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Two blocks with masses 3.0 kg and 5.0 kg are placed on a horizontal frictionless surface....

Two blocks with masses 3.0 kg and 5.0 kg are placed on a horizontal frictionless surface. A light spring is placed in a horizontal position between the blocks. The blocks are pushed together, compressing the spring, and then released from rest. After contact with the spring ends, the 5.0-kg mass has a speed of 2.0 m/s. How much potential energy was stored in the spring when the blocks were released?

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