Which of the following tend to orbit the sun in long, narrow ellipses? A. planets
B. asteroids
C. comets
D. moons

C

Explanation:

D)The hiker had an easy, level trail from 11:00-12:00 and was able to travel the fastest during that time period.

Explanation:

In the table, we see that the duration of the 4 time intervals is always the same (1 h). The velocity of the hiker during each part of the trail is given by

where d is the displacement and t is the time taken.

By applying this formula, we can see that the hiker had the fastest velocity during 11.00 and 12.00, so statement D is correct. In fact, the velocity of the hiker in the 4 parts is:

-10.00-11.00 :

-11.00-12.00 :

-12.00-1.00 :

-1.00-2.00 :

So, we see that the hiker walked fastest between 11.00 and 12.00.