Question

when is abody said to be at rest and in motion​

Answer 1

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Answer:

An object is said to be at rest if it does not change its position with respect to its surroundings with time. Motion: An object is said to be in motion if the position changes with respect to it surrounding and time.

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Answer 2

Answer:

a body is said to be at rest when its position doesn't change with time.

while

a body is said to be in motion if its position changes with time.