Equation for Mass Moving Near Speed of Light: What Is It?

[DeepSpace9]

That calculates how mass a behaves as it nears the speed of light?

Let me rephrase, if we put a speed of light engine inside a school bus. At what speed would the bus top out at? Is there a certain speed that a weight can go? Or can't go faster than?

If so what is an equation that can explain this.

 

[Drakkith]

There is no such thing as a "speed of light engine". If something has mass, it cannot reach the speed of light.
Any amount of mass can be accelerated up to any arbitrary velocity, as long as it remains below c. The more massive the object is, the more energy it takes to do so however.

http://en.wikipedia.org/wiki/Kinetic_energy#Relativistic_kinetic_energy_of_rigid_bodies

 

[Naty1]

..how mass a behaves as it nears the speed of light?

as an added note, the mass experience no change in behavior in its own frame; in other words, it rest mass remains fixed. In addition, the proper time of the mass ticks off at it's same fixed, steady, unchanging rate...

The bus will approach the speed of light asymptotically, never quite reaching reaching c, no matter how much energy is expended.

 

[Khashishi]

Yes, there are equations for all this, and these are very well known and tested in the field of special relativity.
You might want to start with
http://en.wikipedia.org/wiki/Special_relativity
http://en.wikipedia.org/wiki/Lorentz_factor
http://en.wikipedia.org/wiki/Lorentz_transformation