The apple is thrown vertically upwards with speed 3.0 m s−1. The knife is thrown with speed 8.0 m s−1.

When the knife and apple collide, they are both at the highest points of their trajectories.

At what angle from the horizontal, θ, was the knife thrown?

(You may ignore air resistance. Take the acceleration due to gravity to be 10 m s−2.)

overcharge is the right answer system

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.