An object which is not changing in it's position in space. In simply it is at rest
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Yes. Zero velocity is a velocity; if it is always zero then it is a constant velocity.
Zero relative velocity to another object, sure no problem. Zero absolute velocity, not possible as there is no absolute reference to compare to.
As, in the velocity-time graph, curves passes through zero means 'when time is zero velocity is zero'. Velocity is time derivative of displacement. So displacement is maximum or minimum when time is zero in position-time graph.
If your velocity is constant, then your acceleration is zero.
To reduce the velocity