Which statement is true of an object in equilibrium?
a.
the sum of all the horizontal forces is nonzero.
b.
the sum of all the vertical forces is nonzero.
c.
the sum of all forces acting on the object is zero.
d.
at least one of the forces acting on the object is zero.

C

Explanation:

An equilibrium is when all forces are the same or canceled out. So it would have to be c.

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

a. vertically

explanation:

i tried it and took the test

if im wrong then we have different tests