A is a shere that is travelling with a velocity of (3,7)&has a mass of 5k. g.it collides with sphere B & both particles move together with a velocity of (1,4)m/s after collision, sphere B has a mass of 4k. g. find the velocity of B before the collision?

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.