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As part of the Betha Chemistry Tutorial created by the Ohio State University's Department of Chemistry, the following explanation was given:

The x, y and z coordinates of a particle as a function of time are known as the trajectory or orbit of a particle. The laws of classical physics predict the trajectory of a particle for all times once the position and velocity are known at some initial time. For example, if the position and velocity of a cannonball are known at the instant it leaves a cannon, the classical mechanics can predict the path taken by the cannonball at later times and where it will land.[1]


  1. "An Introduction to Quantum Mechanics" at Ohio State University