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

In diagram D, the points become farther apart and then closer together, indicating a change in speed. The object is therefore accelerating, starting from rest and increasing in speed before decelerating back to rest. A has a constant speed, B has a negative constant velocity (moving to the left), C has a constant velocity but decreasing speed, and E has a greater constant speed than A, but there is no indication of acceleration.

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