Describe in words the motion plotted in Fig. 2-32 in terms of velocity, acceleration, etc. [Hint. First try to duplicate the motion plotted by walking or moving your hand ]
We will describe the plotted graph of a motion above.
But we need to know what how to read the speed from the graph
The slope of x-t graph of a motion gives velocity
The x-t graph of car A is given aside. The slope of the graph gives its velocity.
The x-t graph of car B is given aside.
The slope of car A is bigger than slope of carB. So velocity of car A is bigger than car B. In both two motions above, the velocity of the objects are constant , the slopes of the graphs are constant
The x-t graph of car C is given aside. It is a curve, so its slope is changing. If slopes changes velocity changes.
The slope of the line tangent to graph at point gives velocity of object at that point.
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We will draw the tangent lines to the graph at different points to see the velocity change.