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**Spring Problem**

I need some help or hints on this exercise

When a certain linear spring has a lenth of 180mm, the tension in it is 170N. FOr a length of 160mm, the compressive force in the spring is 130N.

a. What is the stiffness of the spring in SI units? In U.S. Customary units?

b. What is its unstretched length in SI units? In U.S. customary units?

This exercise is from my Engineering statics book in the section talking about units.

a. They are asking for the spring constant k, but for which spring do they want?

I calculated the stiffness of the first spring, 944 N/m and 64.7 lb/ ft just divided the force and the length.

b. the keyword unstretched is confusing me in this part.

Yea the topic is mispelled, couldn't change it

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