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One might ask if the now largely abandonned formulation of relativity
which uses "relativistic mass,"
m=gamma*m_0 where m_0 is rest mass, doesn't provide a more intuitive
representation of inertia thought of as a resistance to a change in
motion. It would seem that a particle moving at a speed of
0.99*c would be more difficult to accelerate than one at or nearly at
rest corresponding to its greater (relativistic) mass.
can extract the same useful formulas ... from
either, and it hardly matters, as far as practical results are
concerned,