Review the graph below, which plots total distance traveled versus time of travel for a moving object.
Image
Why do the values on the graph form a straight line?
A.
The speed is constant.
B.
The distance remains unchanged.
C.
The direction of motion stays the same.
D.
The speed gradually increases over time.
A. The speed is constant.
The fact that the graph forms a straight line indicates that the object is traveling at a constant speed. This means that the distance traveled by the object increases linearly with time. If the speed was changing - either gradually increasing or decreasing - the graph would not be a straight line.