A ball of mass 0.25kg and velocity 5 m/s collides head on with a ball of mass 0.8 kg that is initially at rest. Assuming the collision is elastic, what are the velocities of the balls after the collision

260 miles per hour

explanation:

increases it

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.