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OpenStudy (anonymous):
The spring of a spring balance is 7.0 in. long when there is no weight on the balance, and it is 7.6 in. long with 8.0 lb hung from the balance. How much work is done in stretching it from 7.0 in. to a length of 13.3 in.?
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OpenStudy (anonymous):
the answer is 3,121,863 ft
OpenStudy (anonymous):
where does 84 come from?
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