Work needed to stretch a spring

[mathcrzy]

Homework Statement

A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 4.2 cm to x = 6.2 cm, where x is the displacement from its unstretched length.

Homework Equations

Fs=kx

The Attempt at a Solution

Fs=-kx
=(88)(2)
Fs=176 J

 

[Kurdt]

The question asks you to determine the work done from a graph. Do you know how to calculate work from a force/distance graph?