An airplane flying at 57 m/s releases a crate of supplies that lands 821 m from where it was released. How high was the plane flying? 1020 m
14.4 m
71 m
5910 m

explanation:

newton's third law, for every action there is an equal and opposite reaction.

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.