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Block A has mass 1.20 kg and Block B has mass 2.9 kg. They are forced together, compressing spring S between them, then the system is released from rest on a level, frictionless surface. The spring, of negligible mass, is not fastened to either block and drops to the surface after it has expanded. Block B acquires speed of 1.00 m/s

how much potential energy was stored in the compressed spring?

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