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Which of these propellants is used for upper stages in multi-stage rockets?

Which of these propellants is used for upper stages in multi-stage rockets? Correct Answer Liquid propellant

The upper stages of the multi-stage rockets are lighter and require lesser thrust this is because there is absence of atmospheric drag at higher altitudes, because of increase in mass ratio and efficiency, liquid propellants such as the liquid oxygen and liquid hydrogen is used.

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