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Choose the incorrect statement from the following :

1. The speed of satellite in a given circular orbit remains constant
2. For a planet revolving around the sun in an elliptical orbit, the total energy of the planet remains constant
3. The linear speed of a planet revolving around the sun remains constant
4. When a body falls towards earth, the displacement of earth towards the body is negligible

Correct answer: The linear speed of a planet revolving around the sun remains constant

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