AP Physics 1 Exam Question:

The following velocity vs time graph represents the motion of an object. Use the graph to answer the questions below.

1. At which time(s) is the object momentarily at rest? Justify your answer.

Answer:

To determine the time(s) when the object is momentarily at rest, we need to identify the points on the graph where the velocity is zero.

From the graph, we observe that the velocity is zero at two distinct points: initially at time t = 0 s, and again at time t = 6 s.

1. At t = 0 s, the object's velocity changes from positive to negative, indicating a change in direction. At this point, the object is momentarily at rest.

2. At t = 6 s, the object's velocity changes from negative to positive, indicating another change in direction. At this point, the object is momentarily at rest again.

Therefore, the object is momentarily at rest at t = 0 s and t = 6 s.

Please note that the graph only provides information about the velocity of the object at different times, not about its position or any other aspect of motion.