For a dropped object (ignoring air resistance), the correct description of acceleration in both the horizontal and vertical directions is:
Acceleration is -9.8 m/s² in both directions.
However, it's important to note that in the horizontal direction, if we assume no air resistance, the acceleration is actually 0 m/s² because the object does not experience any horizontal forces. Therefore, a more precise statement would be:
- Vertical acceleration (due to gravity) is -9.8 m/s².
- Horizontal acceleration is 0 m/s².
Thus, none of the provided answers accurately describe the situation completely, as only one direction (vertical) has the acceleration of -9.8 m/s², while the horizontal direction has zero acceleration.