When a moving object reduces its speed, what happens to the objects acceleration in relation to its velocity?

-- When the object's acceleration is in the same direction
as its velocity, the object's speed increases.

-- When the object's acceleration is in the direction opposite to
its velocity, the object's speed decreases.

-- When the object's acceleration is in the direction perpendicular
to its velocity, its speed doesn't change, but its direction does.

Gas is all around us which means that the atmosphere

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