Consider the mechanical system consisting of two springs and a block, as shown.Which one of the five electrical circuits (I, II, III, IV, V) is the analog of the mechanical system? 
Definitions:
Indifference Curves
Graphical representations in economics showing combinations of goods among which a consumer is indifferent, helping to analyze consumer choices.
Nickels
A five-cent coin made by the United States Mint.
Quarters
In financial and business terms, one of the four three-month periods into which the fiscal year is divided for reporting and forecasting purposes.
Marginal Rate
The rate at which something changes with each additional unit, such as the marginal tax rate, which is the rate applied to each additional dollar of income.
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