Why is acceleration always constant?

Why is acceleration always constant?

There is more than one correct answer.

wer: A and D. All of beginner physics deals with constant acceleration. This helps us simplify the learning process. In the real world however, the acceleration of different systems is capable of changing. Take gravity for example. Although we say it’s a constant 9.81 m/s2, the acceleration due to gravity actually varies with height. This is why B and C are incorrect.