Mass is defined as the proportion of the force applied to a body to the acceleration produced. In classical mechanics that proportion of force to acceleration was assumed constant, hence so was the mass of the accelerated body. In other words, mass was regarded as absolute. However, in modern mechanics, the effect of increasing time dilation with increase in motion implies diminishing returns on acceleration in proportion to the force applied. This means that mass is no longer a constant proportion of force to acceleration but increases with motion relative to the observer in the way relativists describe. Time dilation in POAMS implies that same consequence for relativistic mass and energy.

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