9) An 8kg bowling ball rolling at 2m/s hits a pillow stopping it in
0.5sec.
a) What was the average force exerted on the
pillow?
b) What is the average force the pillow exerts
on the bowling ball?

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.

365.25 earth days are in the year of a light year