In Example 9.8, consider the situation from the instant the brick is released to the instant at which it has zero velocity (when the spring compression is greatest). Draw an energy diagram for a system that comprises 

(a) the spring alone

(b) Earth, spring, and brick.

Data from Example 9.8 

A brick of inertia \(m\) compresses a spring of spring constant \(k\) so that the free end of the spring is displaced from its relaxed position. What is the work done by the brick on the spring during the compression?