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Position vector for the center of mass from an arbitrary origin

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Prove that position vector for the center of mass from an arbitrary origin is given by this equation.
 
Classical Mechanics - Position vector for the center of mass from an arbitrary origin. Classical Mechanics - Position vector for the center of mass from an arbitrary origin.
Prove that the magnitude R of the position vector for the center of mass froman arbitrary origin is given by the equation:
kinetic energy
(Source: Herbert Goldstein, Classical Mechanics - Chapter 01)
 




Solving for ri · rj realize that rij = ri - rj. Square ri - rj and you get


Plug in for ri · rj