A spring is 18.0 cm long when it is lying on a table. One end is then attached to a hook and the other end is pulled by a force that increases to 24.0 N , causing the spring to stretch to a length of 19.4 cm

Part A

What is the force constant of this spring?

Part B

How much work was required to stretch the spring from 18.0 cm to 19.4 cm ?

Part C

How long will the spring be if the 24.0 N force is replaced by a 48.0 N force?