Answer
a. The velocity is zero where the graph is horizontal, at point IV.
b. The velocity is constant and positive where the graph is a straight line with positive slope, at point I.
c. The velocity is constant and negative where the graph is a straight line with negative slope, at point V.
d. The slope is positive and increasing in magnitude at point II.
e. The slope is positive and decreasing in magnitude at point III.
Work Step by Step
The instantaneous velocity is the slope of the tangent to the x versus t graph. The sign of the slope indicates the direction of the velocity.
