The three dimensional graph, with three axes, labeled x, y, and z, shows a curved line running through it, which represents the trajectory of a particle. There is a vector labeled X as a function of time, running from the origin (0,0,0), to a point on the curved line. The point that the vector ends at is signified by a big red dot, which represents the particle at a given time in history. A vector labeled V as a function of time, t, which represents the velocity of the particle, extends from the red dot, the particle, outwards on a path that is tangent to the curved trajectory of that particle.
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