On Mon, 15 Oct 2007 07:49:45 -0700, toad
wrote:

On 15 Oct, 14:27, (Richard Casady) wrote:

Why wouldn't it accellerate indefinitely with no friction anywhere in
the system.

....because as it approaches the speed of light it will require
infinate energy.

Of course not. It will continue to acquire kinetic energy at the same
rate, so many foot pounds per second. It will mostly get heavier
rather than going faster My 'calculator that takes no prisoners',
[HP48] will do the calculations for E=MC^2. Without a calculation I
will say that it would take a long time to double the mass, but there
is no upper limit if you have the source of power.

Casady