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An elastic cord is 61 cm long when a weight of 50 N hangs from it but is 83 cm long when a weight of 75 N hangs from it. What is the "spring"

An elastic cord is 61 cm long when a weight of 50 N hangs from it but is 83 cm long when a weight of 75 N hangs from it. What is the "spring" constant k of this elastic cord?
___N/m

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