FIGURE 3.3 shows a ball sliding from rest at point A on a curve rail. The speed of the ball at point B is 2 ms^-1 . Calculate the (a) height of h1
(b) speed at point C if the height of h2 is 15 cm.

[5 marks]

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.