In reply to  David Roberson's message of Tue, 15 Mar 2016 11:19:13 -0400:
Hi,
[snip]
>When might somehow be important but if you take the process to the extreme you 
>get a result that doesn't make any sense.  For example, if the spaceship 
>continues to use up its mass in a constant acceleration process that requires 
>power and thus energy to be expended for the drive, then eventually there will 
>be no mass left at all.  All of the original mass is lost if this takes place. 
> That does not make sense.

The process stops, when all the mass has been converted into kinetic energy. 

The only thing I know of that only has kinetic energy and no mass is EM
radiation.

Regards,

Robin van Spaandonk

http://rvanspaa.freehostia.com/project.html

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