An elastic cord is 58 centimeters long when a weight of 77 N hangs from it but is 90 centimeter long when a weight of 200 N hangs from it. What is

An elastic cord is 58 centimeters long when a weight of 77 N hangs from it but is 90 centimeter long when a weight of 200 N hangs from it. What is the spring constant of this elastic cord?

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