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Noun
1. relative velocity
Wikipedia definition
2. Relative velocityIn non-relativistic kinematics, relative velocity is the vector difference between the velocities of two objects, as evaluated in terms of a single coordinate system. For example, if the velocities of particles A and B are and respectively in terms of a given coordinate system, then the relative velocity of A with respect to B (also called the velocity of A relative to B,, or) is .
Read “Relative velocity” on English Wikipedia
Read “相対速度” on Japanese Wikipedia
Read “Relative velocity” on DBpedia

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