A displacement vector, u (ux,uy), is used to track the motion of a particle and quantifies the difference between two points in space, the current position (denoted by position vector x) and the original position (denoted by the position vector X). The relationship between the two position vectors is then
A. u = x - X
B. u = X - x
C. u = x + X
D. u = x * X
Answer: A
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Biomechanics
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