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Relative motion
The relative velocity
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 of an object or observer B in the rest frame of another object or observer A.
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