The forces required to extend a spring to various lengths are measured. The results are shown in the following table. Using the data in the table, plot a graph that helps you to answer the following two questions:
(a) What is the spring constant?
(b) What is the relaxed length of the spring?

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Force (N) Spring length (cm 14.5 18.0 21.5 25.0 28.5 1.00 2.00 3.00 4.00 5.00