Q.

Which conservation principle is applicable in the case of the motion of a rocket?

A. Conservation of mass
B. Conservation of charge
C. Conservation of momentum
D. Conservation of energy
Answer» C. Conservation of momentum
Explanation: The motion of a rocket is an application of Newton's third law of motion and law of conservation of linear momentum. The operation of a rocket illustrates the conservation of momentum. Just before launching, the momentum of the rocket is zero. When the rocket is fired, it forces a jet of hot gases with a high velocity through the nozzle.
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