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The scale of a spring balance that reads from 0 to 12.9 kg is 16.7 cm...

The scale of a spring balance that reads from 0 to 12.9 kg is 16.7 cm long. A package suspended from the balance is found to oscillate vertically with a frequency of 2.16 Hz. (a) What is the spring constant? (b) How much does the package weigh?

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