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Note: This problem has dynamic elements. This means elements such as numbers and consequently the step-by-step solution and the final answer may change overtime. Therefore, there may be a difference between a problem that is published online and the same problem exported into a PDF document.
The potential energy of the spring decreases by .
The unknown energy is the elastic energy which increases by .
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is hung on a spring. In doing so, the spring is stretched by 
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