A Kilometre is a mid range unit of linear distance. It is used mainly to indicate the separation of places geographically.
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very small ofr tiny things because "milli" means small.
A person's mass, airline [check-in] luggage, sack of potatoes, cereals.
Divide speed by time. In this case, you get (kilometers / hour) / hour, or kilometers/hour2. That means, how much does the speed change in an hour.
a flag pole,a truck,
It is not likely that a tall building would be measured in kilometers. Actually the tallest building in the world is only 829.8 meters which is known as Burj Khalifa in Dubai. Buildings are commonly measured in feet or meters.