To stretch a spring 9.00 cm from its unstretched length, 19.0 J of work must be done. (a) What is the force constant of this spring? (b) What magnitude force is needed to stretch the spring 9.00 cm from its unstretched length? (c) How much work must be done to compress this spring 4.00 cm from its unstretched length, and what force is needed to compress it this distance?

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