Constant acceleration is the primary type of motion studied in first-year physics classes. Things like free fall with gravity (g = 9.8 m/s^2), and cars and runners starting races, or things moving down hills, can all be approximated as having constant acceleration. Keep in mind that it is a rarity to have constant acceleration in real life, but this is still a valid approximation to use.
Check out a couple of examples to review the use of kinematics equations. This will not go away, even as we get into NON-constant forces and accelerations using the calculus.
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