6 m would be used to measure flagpole. 600 m is a bigger unit.
miles
You would typically use a unit of weight, such as grams or ounces, to measure a cherry.
gallons
You would typically use the metric unit of centimeters to measure the growth of your hair.
You would use the metric unit "liters" to measure the capacity of a hot water tank.
Meter, kilometer is the SI equivalent to the mile.
Metres.
I would use Meters
One of length. I'd go for Metres and Centimetres but you could use Feet and/or Yards. Or declare a new unit of "Flagpole" which is exactly one flagpole long....
It depends on the relative height of the flagpole. If it's short, like a flag mast on a boat or building, probably feet and inches would do. If it's very tall, like the flagpole on top of a building or monument, yards and feet might be more appropriate.
division
You would use the unit of measure called "kilograms" to measure the mass of an elephant.
The Unit Used To Measure A Train Can Be Kilometer.
miles
cm
What measure of units would you use to measure the thickness of a phone book
1 kilometre = 1000 metres. You now have all the information required to answer the question.