The rest mass of a particle depends upon how fast it is moving.

Name: The rest mass of a particle depends upon how fast it is moving.
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Quizplus · Accepted Answer

The rest mass of a particle is the same regardless of its speed or motion. It is a fundamental property of the particle and does not change. However, the relativistic mass of a particle does increase as its velocity approaches the speed of light.

The Rest Mass of a Particle Depends Upon How Fast