The picture on the right shows an exploding firework high up in the air,just after the firework has come to a rest.Which point best describe the center of mass of the explosion? 
Picture by H.K.Ng
Definitions:
Risk-free Rate
The theoretical return of an investment with zero risk, often represented by the yield on government securities.
Beta
Beta is a measure of a stock's volatility in relation to the overall market; a beta greater than 1 indicates higher volatility, while a beta less than 1 indicates lower volatility.
Gross Domestic Product
The total value of all goods and services produced within a country over a specific time period, reflecting the overall economic health.
Gross World Product
The market value of all final goods and services produced in the world during a given period, usually a year.
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