Question

When is a body said to be at rest?

• A. A body is said to be at rest when its position doesn't change with time.
• B. A body is said to be at rest when its acceleration doesn't change with time.
• C. A body is said to be at rest when its acceleration changes with time
• D. A body is said to be at rest when its position change with time.

Answer 1

Answer: (A)

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

A body is said to be in a state of rest when it does not moves or equivalently it's position does not change with time.