Suppose you have an isolated system in which two objects about to collide have equal and opposite momenta. if the collision is totally inelastic, what can you say about the motion after the collision?

Referring to the laws of conservation of momentum we have that there is a conservation of the linear impulse but there is a loss of kinetic energy on the system, this while the collision is inelastic.

From the theory we know that the momentum is preserved, therefore the initial momentum must be the same final momentum.

Both have equal vector magnitudes of their momentum but their directions are completely opposite, which would indicate that the initial and final momentum is zero. This while considering the aforementioned law.

For inelastic collisions there is the possibility that the objects will join after the collision, therefore the speed of the two objects is the same.

Therefore, the two objects are at rest after 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.

inverse v=i*r

nice nice