Question

8. When is a body said to be at rest?​

Answer 1

Answer:

Rest is the state of an object being stationary relative to a particular frame of reference or another object; when the position of a body with respect to its surroundings does not change with time it is said to be "at rest".

Explanation:

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Answer 2

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A body is said to be at rest if it doesn't change it's position with respect to its immediate surroundings.