The definition of acceleration is the rate at which an object's velocity changes. Just with zero magnitude, zero acceleration still counts as acceleration.
Every item travelling toward or away from the earth experiences acceleration caused by gravity, and each object's average acceleration is the same. The object's mass has no bearing on it.
A velocity change with constant acceleration is one that does not alter over time. If a car raises its speed by 20 mph in one minute and then by another 20 mph in the next, its average acceleration stays constant at 20 mph per minute.
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