Two air-track carts move toward one another on an air track. Cart 1 has a mass of 0.27 kg and a speed of 0.99 m/s. Cart 2 has a mass of 0.66 kg. Part APart complete What speed must cart 2 have if the total momentum of the system is to be zero

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.

its a 5.5 n

glad that