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6 Fundamentals of Kinematics We may define a new unit vector uˆ r on r and show r by r = ruˆ r (1. buana88 5) The equation r = ruˆ r is called the natural expression of r, while the equation r = xˆı+yjˆ+zkˆ is called the decomposition or decomposed expression of r over the axes . slot gacor demo maxwin