Deceleration is a type of acceleration. They’re treated the same in the math.
The deceleration—the change in velocity at the moment the object hits the ground—is what fits into the “a” in that formula, not the acceleration due to gravity.
Acceleration due to gravity is still relevant because the object that fell further experienced that acceleration longer. That means it reached a higher velocity and therefore experienced greater deceleration when the velocity of the object suddenly dropped to zero as it contacted the ground. The force of impact scales with that deceleration.
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