An object is thrown upward. at the moment when it has reached the top of its path and its velocity is zero, the acceleration is

The acceleration of the object at the highest point=g=-9.8 m/s²

When an object is thrown upwards , its velocity decreases continuously until it reaches the highest point. At the highest point, velocity of the object is zero. The acceleration during the upward journey and at the top is constant and is called as acceleration due to gravity denoted by g. It acts downwards and its value is -9.8 m/s².

So the acceleration at the top =-9.8 m/s²

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explanation:

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