# If a spring has a constant of #7 (kg)/s^2#, how much work will it take to extend the spring by #22 cm #?

##### 1 Answer

Apr 30, 2018

Given,

Recall how external force is related to these variables,

, and let's use the average force in determining the work done over displacement

This is familiar to elastic potential energy, which we are essentially working against in the positive direction. Hence, the work required to do this is,