Rocket works on the principle of conservation of _______.

(1) Mass

(2) Energy

(3) Momentum

(4) Velocity

**Answer:**

(3) Momentum

**Explanation:**

The conservation of momentum concept governs the operation of the rocket. Unlike in one direction, where they begin to expel gases after the rocket has begun to travel, they begin to discharge gases after the rocket has begun to travel, and therefore the rockets continue to gather momentum so that they get faster and faster as long as the engine is running.

**Conservation of momentum**

The conservation of momentum principle states that

“For two or more bodies in an isolated system acting upon each other, their total momentum remains constant unless an external force is applied. Therefore, momentum can neither be created nor destroyed.”

Mathematically it is given by,

m_{1}u_{1}+m_{2}u_{2}=m_{1}v_{1}+m_{2}v_{2 }

Where,

_{ }is a mass of the bowling ball

is the mass of the football

and are the initial velocities

and are the final velocities.

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