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Newton's first law: law of inertia

It states that if the vector sum of all forces acting on an object is zero, then the acceleration of the object is zero and its velocity is constant.

Newton's second law: law of resultant force

The rate of change of momentum of a body is proportional to the net force acted on the body, and happens along the straight line on which that force acted upon.

Newton's third law: law of reciprocal actions

If body A exerts a force on body B, then body B exerts an equal and opposite reaction force of the same nature on body A.

It is an example of the second law and the third.

The second law being:

The rocket is burning fuel, therefore change in mass, therefore change in momentum

therefore there is a force, according to newton's second law.

The third law being:

Imagine the rocket as 1 object and the smoke as another.

The rocket exert a force on the smoke and the smoke exert a force on the rocket.

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