# Relative velocities (general case)

## Description

The relative velocity (v_A|B) is the velocity of an object or observer B in the rest frame of another object or observer A.

The general formula for the relative velocity (v_A|B) of an object or observer B in the rest frame of another object or observer A is given by the shown formula

Related formulas## Variables

v_{BA} | relative speed (m/s) |

c | speed of sound (m/s) |

v_{A} | speed of object A (m/s) |

v_{B} | speed of object B (m/s) |