You're very close! To find the acceleration of an object moving in a straight line, you must calculate the change in its speed during each unit of time.

Here's why:

* Acceleration is the rate at which an object's velocity changes.

* Velocity is a measure of both speed and direction.

* Speed is how fast an object is moving.

So, to determine acceleration, we need to know how much the speed changes over a specific period of time.

Let me know if you'd like a formula or examples!