Which of the following best describes constant acceleration?

• A. Acceleration increases at a constant rate over time.
• B. Velocity remains the same in magnitude and direction over time.
• C. $\mathrm{Acceleration}$ remains the same in magnitude and direction over time.
• D. Position changes at a constant rate over time.

Answer: (C)

Verified step by step guidance

1. Understand the definition of acceleration: Acceleration is the rate of change of velocity with respect to time.
2. Recall that constant acceleration means the acceleration vector does not change in magnitude or direction as time progresses.
3. Analyze the options: 'Acceleration increases at a constant rate' implies acceleration is changing, so it is not constant acceleration.
4. 'Velocity remains the same in magnitude and direction' means zero acceleration, which is a special case but not the general definition of constant acceleration.
5. 'Position changes at a constant rate' describes constant velocity, not constant acceleration.