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Relative Velocity Calculator
Find how fast one object moves as seen from another, for motion along the same straight line at constant speeds in either direction.
v_rel = vā ā vā
Relative velocity is the difference of the two velocities, and it can be negative when the second object is faster.
Relative velocity
ā m/s
The calculation runs entirely in your browser ā no data leaves your device. Change any number and the answer updates instantly.