A 50.0 kg shell is fired from a cannon on Earth's surface to a maximum height of 400 m. What is the

potential energy?

a 196,000

b 170,000 J

C 185,000 J

d 190,000 J

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I also calculated it with 9.8 as the gravity and the answer was 196000 J

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.