An object starts its motion with a constant velocity of 2.0 m/s toward the east.After 3.0 s,the object stops for 1.0 s.The object then moves toward the west a distance of 2.0 m in 3.0 s.The object continues traveling in the same direction,but increases its speed by 1.0 m/s for the next 2.0 s.Which graph below could represent the motion of this object?

Question

Quizplus · Accepted Answer

In the first segment of motion, the object moves with a constant velocity towards the east, so the graph should be a straight line with a positive slope. 
In the second segment, the object stops moving for 1.0 s (so the graph should be flat), and then moves towards the west at a constant velocity (so the graph should be a straight line with a negative slope). 
In the final segment, the object continues moving towards the west (so the graph remains a straight line with a negative slope), but with an increasing speed (so the slope of the line should become steeper). 
The only graph that fits all of these criteria is choice D.

An Object Starts Its Motion with a Constant Velocity of 2.0