A spring with a spring constant of 2.5 N/m is stretched by 0.2 m. What is the potential energy in the spring

Explanation:

PE = (Δ)

where k is the spring constant and Δx is the displacement of the spring when an object is hung from it. Plugging in:

which gives us

PE = .05 J

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid

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.