Time stops etc.
As a result, to the person measuring the ball, it is many times more massive and has stopped moving. To the object itself, it's mass never changed. The change in mass itself is only a change in relative measurement, though the atoms do in fact increase in size. If anyone can explain that better, please do. So since an object traveling at C is not moving and can only gain more mass and not velocity when energy is added, along with the fact it can only get shorter by becoming a negative length, warp speed is impossible.