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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 = v₁ − v₂

Relative velocity is the difference of the two velocities, and it can be negative when the second object is faster.

Velocity of object 1 (m/s)

Velocity of object 2 (m/s)

Relative velocity (m/s)

Relative velocity

… m/s

The calculation runs entirely in your browser, no data leaves your device. Change any number and the answer updates instantly.