Accelerating an internal mass towards the speed of light increases mass in such a way to produce displacement of the encompassing mass. The mass conversion is t

Accelerating an internal mass towards the speed of light increases mass in such a way to produce displacement of the encompassing mass. The mass conversion is translated to heat. Enormous energy expenditure might be available through true fusion. Work out the potential of the electron volt translated to joule of mass acceleration, to the acquired mass as approaching the speed of light. For example, how heavy would an ounce of material become if accelerated to 80% of light speed? Enough to displace the weight of a ten thousand ton craft by how much?