A force of 160 N stretches a spring 0.050 m beyond its unscratched length:
(a) What magnitude of force is required to stretch the spring 0.015 m beyond its unscratched length? To compress the spring 0.020 m?
(b) How much work must be done to stretch the spring 0.015 m beyond its unscratched length? To compress the spring 0.020 m from its unscratched length?