when is an object said to be at rest give an example
Rest (physics) In physics, 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". According to the theory of relativity, it is said that an object is "at rest relative to" another. For example, a train decelerates approaching a station and eventually comes to rest alongside the platform. The train can be said to be "at rest with respect to the station", or, as the correct frame of reference is usually implicit and/or provided by context, simply "at rest". In reality, there is nothing at absolute rest. For example, Earth's gravitation constantly pulls objects toward its surface, while Earth is one of the objects the Sun constantly pulls towards itself, causing it to orbit the Sun; the Sun, in turn, orbits the center of the Milky Way; and so on.
WALL-E In 2805, Earth is an abandoned planet covered in trash, with its people evacuated by megacorporation Buy-N-Large on giant starliners. BnL has left behind WALL-E robot trash compactors to clean up; however, all have since stopped functioning, except one unit who has gained sentience and is able to stay active using parts from other units. One day, WALL-E discovers a healthy seedling, which he returns to his home. Later, an unmanned spaceship lands and deploys an EVE probe to scan the planet. WALL-E is infatuated with EVE, who is initially hostile but gradually befriends him. When WALL-E brings EVE to his trailer and shows her the plant, however, she suddenly takes the plant and goes into standby mode. WALL-E, confused, unsuccessfully tries to reactivate her. The ship then returns to collect EVE, and with WALL-E clinging on, returns to its mothership, the starliner Axiom.