Kelvin, celsius and fahrenheit are three types of what scales?

They are temperature scale.

Explanation:

Kelvin scale: It is the absolute scale to measure the temperature.

For Kelvin scale, the melting point of ice is 273 degree, the boiling point of water is 373 degree and the number of divisions between the melting point and the boiling point is 100.

For Celsius scale, the melting point of ice is 0 degree, the boiling point of water is 100 degree and the number of divisions between the melting point and the boiling point is 100.

For Fahrenheit scale, the melting point of ice is 32 degree, the boiling point of water is 212 degree and the number of divisions between the melting point and the boiling point is 180.

the bal will not change its velocity.

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day