This three dimensional graph has three axes, the x, y, and z. It has a curved line running through it, depicting the trajectory of a particle. There is a vector traveling from the origin to the particle's current position on it's trajectory. This vector is labeled capital bold-faced X as a function of time, t. There is another vector traveling from the origin of the graph to the beginning of the trajectory, at time, t, equal to zero. This vector is labeled capital bold-faced X subscript zero.
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