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Q: Flying a rocket can be understood by…
  • A. Energy-conservation law
  • B. Momentum-conservation law
  • C. First law of motion
  • D. Second law of motion
Correct Answer: Option B - Flying of rockets – When a rocket is fired, it throws a stream of burnt gases in the vertically downward direction with a large velocity. So the outgoing gases have large momentum in the downward direction. According to the law of conservation of momentum, the rocket gets an equal and opposite momentum which causes it to fly up.
B. Flying of rockets – When a rocket is fired, it throws a stream of burnt gases in the vertically downward direction with a large velocity. So the outgoing gases have large momentum in the downward direction. According to the law of conservation of momentum, the rocket gets an equal and opposite momentum which causes it to fly up.

Explanations:

Flying of rockets – When a rocket is fired, it throws a stream of burnt gases in the vertically downward direction with a large velocity. So the outgoing gases have large momentum in the downward direction. According to the law of conservation of momentum, the rocket gets an equal and opposite momentum which causes it to fly up.