Relative velocity is the velocity of one object observed with respect to another object as a reference. This calculator helps you visually understand relative velocity in various scenarios with real-time simulation.
| Parameter | Object A | Object B | Relative Value |
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Relative velocity is velocity that varies depending on the observers state of motion. The velocity seen by a stationary observer differs from the velocity seen by a moving observer.
The velocity of a person walking in a train appears to a passenger in the train as just the walking speed, but to a person standing at the station as walking speed + train speed.
When Car A travels at 110 km/h and Car B at 90 km/h in the same direction, the relative velocity of Car B felt by Car As driver is -20 km/h. This means Car B appears to be moving backward at 20 km/h.
When two trains move in opposite directions at 100 km/h each, the other train appears from one train to be passing at 200 km/h.
When a boat crosses perpendicular to a river with 5 km/h current at 10 km/h, the actual velocity of the boat as seen from ground is approximately 11.2 km/h.
When overtaking, relative velocity should be considered to ensure sufficient distance and time. Especially when overtaking large vehicles, more time is needed.