A physics professor leaves her house and walks along the sidewalk towards campus. After `5 min`, it starts to rain and she returns home. Her distance from her house as a function of time is shown in .
.
At which of the labeld points is her velocity
a. Zero
b. Constant and positive
c. Constant and negative
d. Increasing in magnitude .

Explanation

a. At point IV, velocity is zero because slope is zero at this point.
b. At point I slsitive and constant.
c. At point V, slope is negative and constant.
d. At point II, slope is positive but decteasing.
e. At point III, slope is positive but decreasing.