An object moves along the x axis as shown in the diagram. At which point or points is the object instantaneously at rest?
A) A and E
B) B, D, and E
C) C only
D) E only
E) None of these is correct.

Question

An object moves along the x axis as shown in the diagram. At which point or points is the object instantaneously at rest?
A) A and E 
B) B, D, and E 
C) C only 
D) E only 
E) None of these is correct.

Quizplus · Accepted Answer

In order for an object to be at rest, its velocity must be zero. Looking at the graph, we can see that the velocity of the object is zero at points B, D, and E. Therefore, the correct answer is choice B.

An Object Moves Along the X Axis as Shown in the Diagram