The Answer is D!

Consider the motion diagram. It illustrates a car's velocity (V) and acceleration (A). Determine is there is a change in either velocity or acceleration. Is there a change in both? Explain.

A) The velocity is changing because the car is slowing down. The car is not accelerating; it would be decelerating.

B) Neither one changes. The velocity remains constant because the car is not changing direction. It is coming to a stop so it is decelerating.

C) The velocity remains constant because the car is not changing direction. The car is slowing down so it is experiencing negative acceleration.

D) Both the velocity and the acceleration change. The car is slowing down = change in velocity. Slowing down would also indicate negative acceleration.