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Question

Jet aeroplanes work on the principle of conservation of, which of the following:

A
Mass
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B
Momentum
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C
Energy
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D
Force
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Solution

The correct option is D Momentum
Jet aeroplanes work on the principle of conservation of momentum that if initial momentum of the system was zero then final momentum of the system must also be zero. Hence the jet moves in forward direction as a result of recoil of the gases of the fuel ejaculated in the backward direction.

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