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I am doing exercises regarding relativity. I know how to calculate relative speed in one dimension, but I have some problems with the relative speed in 2D.

If we have two spaceships, one is moving in the x direction with speed 0.7c and one is moving in y direction with speed 0.85c.

What is the speed of second spaceship as it has been seen by first pilot?

I have tried to do a geometric sum, but I don't know how to calculate gamma.

Any comment would be helpful.

Regards,

Niko

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# Speed of two spaceships

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