Ablock is given a very brief push up a 20.0â° frictionless incline to give it an initial speed of 12.0 m/s. (a) how far along the surface of the plane does the block slide before coming to rest?

First we calculate the time it took before coming to rest. We use the vertical component of velocity in this case. The formula is:

vy = v0 sinθ – g t

where, vy is final velocity at the peak = 0,  v0 sinθ = initial vertical velocity, g is acceleration due to gravity, t is time

therefore:

0 = 12 sin20 – 9.8 t

t = 0.4188 s

Then calculate the distance using the horizontal component:

d = v0 cosθ t

d = 12 cos20 * 0.4188

d = 4.72 m

increase masses, decrease separation

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.