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We find difficulties with the constancy of the speed of light and yet if unaffected by external forces all objects will maintain a constant speed. The vector direction doesn't change. So the natural state of objects where forces are absent is constant speed. So there should be no mystery. In the case of inertia this will increase in direct proportion to the increase in relativistic mass. Which is due to a change in the magnitude of the vector of the objects velocity. This does not necessarily apply to a change in vector direction alone.