Question 15 Graph of position versus time with position on y axis from 0 to 80 miles and time on x axis from 0 to 5 hours. Segment 1 goes from 0, 0 to 1, 40. Segment 2 goes from 1, 40 to 2, 40. Segment 3 goes from 2, 40 to 3, 60. Segment 4 goes from 3, 60 to 4, 75. Segment 5 goes from 4, 75 to 5, 75.
In the Position versus Time graph of an object moving in a straight line, what is the average speed for the object during the second hour? (2 points)

a
Zero

b
20 mph

c
40 mph

d
80 mph