An object is said to be at rest when
Aits velocity is zero for all observers
Bits position does not change with time relative to a chosen reference frame
Cno force acts on it
Dit remains at the origin of the coordinate system
Answer & Solution
Correct answer: B. its position does not change with time relative to a chosen reference frame
Rest and motion are relative concepts. An object is at rest if its position remains unchanged with time in a specified reference frame; it may still be moving relative to another frame.
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