Answer :
When the acceleration is constant from instant to moment, the kinematic equation cannot be employed.
When shouldn't kinematic equations be used?
The equations are applicable to any motion that can be classified as either a constant acceleration motion (with an acceleration of 0 m/s/s) or a constant velocity motion (with an acceleration of 0 m/s/s). They are never permitted to be employed over any time frame where the acceleration is fluctuating.
What circumstances allow for the employment of the kinematic equations?
We may use a straightforward equation to calculate the average velocity of an object because kinematics equations are utilized when the object's acceleration is constant. Adding the beginning velocity to the final velocity and dividing by two yields the average velocity.
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