A planet travels in an elliptical orbit about a star X as shown.The magnitude of the acceleration of the planet is: 
Definitions:
Per Capita Water
The average volume of water available or consumed per person in a specific region during a defined period, often used in the context of assessing water resources management.
Commodity Prices
The market prices for raw materials or primary agricultural products.
Modernizing Economies
The process by which traditional or less developed economies transform and grow through industrialization and other changes.
Birthrates
The ratio of the number of births in a given population to the total population size, usually expressed per 1000 individuals per year.
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