Use the conservation laws to show that, when the spring in Figure 7.25 expands, the change in the kinetic energy of Earth is negligible and we are therefore justified in using Eq. 7.11.

Equation 7.11

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Figure 7.25 Reversible interaction between a cart and a spring anchored to a post. (a) Forward We know this interaction is reversible... (b) Reverse because it could run in reverse-the reverse process is possible. wwwwww K U v = 0 wwwww x K K K wwwww KU K U U K U U K U wwww K U K U