Two objects are approaching each other on a collision course. each object has a speed of 10 m/s. the mass of object 1 is m1 and the mass of object 2 is m2. after they collide head on, object 2 comes to a complete stop, and object 1 bounces off object 2 and moves away at
5 m/s. what is the mass of object 2 in terms of m1?

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.