What is the average velocity of the particle from rest to 9 seconds? OA.
1 meter/second
OB.
2 meters/second
OC.
3 meters/second
OD.
4 meters/second

B 2m\s

Explanation:

18 m of displacement over the course of 9 seconds

18/9 = 2 m\s

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.