proportionality of time to motion

[shawn1990]

ok, so i understandthat if i travel near the speed of light for a while and come back on earth than i would be younger than the rest....but what if i travel x2 c than does it relate to -ve time travel???
since length, mass, time are proportional to motion, how does it relate to travelling more than the speed of light??

[bcrowell]

ok, so i understandthat if i travel near the speed of light for a while and come back on earth than i would be younger than the rest....but what if i travel x2 c than does it relate to -ve time travel???
Material objects can't move at or above c.

since length, mass, time are proportional to motion, how does it relate to travelling more than the speed of light??

I don't think you mean "proportional," do you? http://en.wikipedia.org/wiki/Proportionality_%28mathematics%29

[Samo84]

@shawn1990 ,dude nothing can bypass the speed of light >.<