Final answer:
The curve of the velocity vs. time graph will be below the x-axis. The correct answer is b. below the x-axis.
Step-by-step explanation:
If an object is moving in the negative direction, the curve of the velocity vs. time graph will be below the x-axis.
This is because the negative direction represents motion in the opposite direction of the positive x-axis. In a velocity vs. time graph, positive velocities are represented above the x-axis and negative velocities are represented below the x-axis.
For example, if we have an object moving in the negative direction with a constant velocity, the velocity vs. time graph will be a horizontal line below the x-axis.
If the object is accelerating in the negative direction, the velocity vs. time graph will have a downward slope, indicating a decreasing velocity over time.
Therefore, the b. below the x-axis