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A 11.9kg block and a 20.1kg block are resting on a horizontal frictionless surface. Between the...

A 11.9kg block and a 20.1kg block are resting on a horizontal frictionless surface. Between the two is squeezed a spring (spring constant = 1400N/m). The spring is compressed by 0.132m from its unstrained length and is not attached permanently to either block. What is the speed of the lighter block after the spring is released?

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