A boy on a bicycle is travelling at a speed of 16 m/s. He applies his brakes and comes to rest in 2.5 s. Calculate his acceleration. You may
assume the acceleration is constant.

Use this formule:a=(v-v⁰)÷t=/\v÷/\t

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.

did yall get answers for this yet