particle at rest
v(t) < 0
A particle at rest means that the particle is not moving and its velocity is zero. This can be visualized as the particle being stationary at a particular position in space. Such particles can either remain at rest or be set into motion if acted upon by an external force. In physics, the term particle is often used to refer to any object or system that has mass and takes up space, and can include atoms, molecules, and subatomic particles. The behavior of particles at rest is often studied in various fields of physics, such as mechanics, thermodynamics, and quantum mechanics.
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