Question

what is the common example of daily life, where mass changes with velocity, except those of in nuclear reactor and speed of light in vacuum??

Answer 1

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The inertia (resistance to acceleration) increases, and the object's tendency to curve space around it increases as it's velocityapproaches the speed of light. But physicists have found it cumbersome to treat mass as a variable, or to keep saying "rest mass" all the time, so we say that the mass-proper stays the same.
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