Question: To stretch a spring 3.00 cm from its unscratched length, 12.0 I of work must be done. (a) What is the force constant of this

To stretch a spring 3.00 cm from its unscratched length, 12.0 I of work must be done.
(a) What is the force constant of this spring?
(b) What magnitude force is needed to stretch the spring 3.00 cm from its unscratched length?
(c) How much work must be done to compress this spring 4.00 cm from its unscratched length, and what force is needed to stretch it this distance?

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