Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below. Which statement is correct?
A) A has the greatest speed and the greatest acceleration.
B) C has decreasing speed.
C) D slows down and then speeds up.
D) D speeds up and then slows down.
E) E has a greater speed than A.

Question

Five motion diagrams in which points represent the positions of an object at equal time intervals are shown below. Which statement is correct? 
A) A has the greatest speed and the greatest acceleration. 
B) C has decreasing speed. 
C) D slows down and then speeds up. 
D) D speeds up and then slows down. 
E) E has a greater speed than A.

Quizplus · Accepted Answer

The motion diagram for D shows that the points are spaced farther apart at later times, indicating an increasing speed. However, the points become closer together again toward the end, indicating a decreasing speed. This means that D speeds up and then slows down. None of the other answer choices are supported by the given diagrams.

Five Motion Diagrams in Which Points Represent the Positions of an Object