Which equation should be avoided if the question suggests constant speed?

When the question suggests constant speed, it is important to consider the implications of the speed being unchanging throughout the duration of the journey. The correct choice emphasizes the notion that speed remains consistent, which means that it does not fluctuate depending on various factors, such as stops.

Choosing the statement that speed is variable based on stops indicates a lack of comprehension about the concept of constant speed. If the speed is constant, then by definition, it does not change despite the presence of stops or other potential influences. This understanding is critical when approaching problems related to motion at constant speed because it emphasizes predictability in calculations involving distance, time, and speed.

In contrast, the other options represent formulas and concepts that can be applicable in contexts where speed is constant or can be clearly defined:

• The equation for speed being equal to distance divided by time provides a fundamental relationship that holds true under constant speed conditions.

• The equation suggesting speed as distance multiplied by time is not correctly formulated for speed; it aligns more with finding distance or other related calculations.

• The last option, distance equals speed plus time, is conceptually inaccurate.

In summary, the selection to avoid is based on the principle that constant speed implies no variability, a foundational understanding in physics and motion-related