Calculating Potential Energy of a Chain

[prepapphysics]

Homework Statement

A (uniform) chain with a mass of 4.7 kg and a length of 2.0 m lies on a table with 0.7 m hanging over the edge. How much energy is required to get all of the chain back on the table?

Homework Equations

W= integral(sumF)dx

The Attempt at a Solution

NO idea where to start.

 

[kuruman]

How much work is required to pull the center of mass of the overhanging 0.7 m over the edge of the table?