(a) a spring exerts a force of 13.0n when stretched 1.3m beyond its natural length. assuming that hooke's law applies, how much work was performed in stretching the spring to this length?
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(b) a spring exerts a force of 4.4n when stretched 1.1m beyond its natural length. how far beyond its natural length the spring can be stretched with 5.12j of work?
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