If a particle's velocity decreases linearly with time from an initial value, what can be said about its acceleration?

If a particle's velocity decreases linearly with time from an initial value, what can be said about its acceleration?

• A. The acceleration is zero.
• B. The acceleration is constant and negative (opposite the direction of motion).
• C. The acceleration is increasing.
• D. The acceleration is positive.

Answer: (B)