Coal is considered to be a non-renewable energy source. which of the following statements is correct? a. coal is a scarce resource. b. coal is an unlimited resource. c. coal is a non-scarce resource. d. coal is not a resource.

The correct statement regarding the coal is option A.

It refers to the natural substance which cannot be replenished with the speed where that people are consuming. Such as  Coal is a finite resource since the limited quantity it takes thousands of years for getting it renewed.

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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

reserve is the answer