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In the other case it will take a infinite energy, according to Einstein, to gain that 'ftl' speed, actually not ever reaching 'c'.

thank you

Quote from: yor_onIn the other case it will take a infinite energy, according to Einstein, to gain that 'ftl' speed, actually not ever reaching 'c'. I derived an expression for the relativistic mass of an object here...sorry, you cannot view external links. To see them, please REGISTER or LOGINRelativistic mass is the quantity m such that p = mv. That derivation shows that as v -> c, m -> infinity as does the momentum p.

The speed of light in other materials is lower than the speed of light in a vacuum...

Couple years ago I made real-time special relativity mass calculator:...sorry, you cannot view external links. To see them, please REGISTER or LOGINYou can enter mass of object, and velocity (either with units m/s, km/h or fraction of c), and instantly (while entering) see how relativistic mass, and Lorentz factor is growing..