The authors suggest that "with new systems," it may be best: group of answer choices to add three additional weeks of alpha and beta testing to expect the worst to expect success with optimism to keep the existing system for two additional years

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

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

it has to be b, about 97 percent.

490 n

f=125n a=2.5m/s2