Posted by **priyanka** on Friday, July 13, 2012 at 11:11am.

A car is travelling at 80km/h in east direction , a train is travelling at 50 m/s in north direction then what is the combined velocity of car and train?

- physics -
**drwls**, Friday, July 13, 2012 at 3:22pm
They should be asking for what is the velocity of the car with respect to the train, or vice versa. The "combined velocity" is the vector sum. The relative velocity is the vector difference.

In this case, they both have the same magnitude. Use the Pythagorean theorem, since the separate velocities are at right angles.

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