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Which of the following is the most appropriate unit for expressing the speed of a rocket in space?

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cm/s

m/hr

km/hr

mm/hr

answer is D.

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Detailed Solution

The speed of a rocket travelling in space is very high.
Among the given units, km/hr is the largest unit and will be appropriate for expressing the speed of a rocket.

Therefore, km/hr will be the most appropriate unit for expressing the speed of a space rocket.

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