Question

get it? explain why you cannot use the acceleration equation for an object that changes direction.

Explanation:

Acceleration is a vector quantity. The basic acceleration equation $a=\frac{\Delta v}{\Delta t}$ assumes motion in a straight - line (constant direction). When an object changes direction, its velocity vector changes not just in magnitude but also in direction. The simple acceleration equation doesn't account for the directional change properly. We need to use vector - based methods to analyze acceleration in such cases.

Answer:

The basic acceleration equation is for straight - line motion and doesn't account for directional changes of velocity vectors when an object changes direction.