A body is suspended from a spring hanging vertically. The body is then pulled downward so the spring stretches. Consider the change in the elastic potential energy (EPE) of the spring and the change in gravitational potential energy (GPE) as the body is pulled down.
A. The GPE decreases but the EPE is unchanged
B. The EPE increases but the GPE is unchanged
C. Both the GPE and the EPE decrease
D. The GPE decreases while the EPE increases
E. The GPE increases along with the EPE
Answer: D
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