Rocket engines lift a rocket from the earth surface because hot gases with high velocity:

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Accepted Answer

1. **Principle:** Rocket propulsion is based on **Newton's Third Law of Motion** ('To every action, there is always an equal and opposite reaction') and the **Law of Conservation of Momentum** [Source 60, 61].
2. **Mechanism:** The rocket engine exerts a large force on the hot gases to eject them backwards at high velocity (Action). As a reaction, the escaping gases exert an equal and opposite force (Thrust) on the rocket in the forward (upward) direction.
3. **Misconceptions:** Rockets do not need air or the Earth's surface to push against; they function efficiently in the vacuum of space where there is no air or ground. Therefore, options suggesting pushing against air or earth are incorrect [Source 55, 60].

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