The figure depicts two carts set on a flat track. On the left is a smaller cart labeled capital A with a rightward velocity labeled lower-case v subscript zero. On the right there is a larger block labeled capital B. Two carts are set on a flat track and roll without friction. Cart A rolls with initial velocity v­0 toward cart B which is at rest. The center of mass of the two-cart system has a velocity vcm, i before the carts collide and vcm, f after the carts collide. In which of the following situations will vcm, i = vcm, f?

are you like autistic or something?

xd

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.