The relative velocity, denoted v → B ∣ A {\displaystyle {\vec {v}}_{B\mid A}} (also v → B A {\displaystyle {\vec {v}}_{BA}} or v → B rel A {\displaystyle {\vec {v}}_{B\operatorname {rel} A}} ), is the velocity vector of an object or observer B in the rest frame of another object or observer A. The relative speed v B ∣ A = ‖ v → B ∣ A ‖ {\displaystyle v_{B\mid A}=\|{\vec {v}}_{B\mid A}\|} is the vector norm of the relative velocity.
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