A rocket works on the principle of: (1) Mass (2) Energy (3) Momentum (4) Velocity

Answer: (3)

The rocket operates on the principle of conservation of momentum. The rockets gain momentum equal to the momentum of the gas expelled from the engine, but in the opposite direction, they begin to expel gases after the rocket has begun to travel and thus the rockets continue to gain momentum, so that they get faster and faster as long as the engine is operating.

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