A van is traveling at a constant speed of 54km. h^-1 in a 40km. h^-1 and the policeman starts his car from rest just as the van passes him. the police car accelerates at 2m. s^-2 until it reaches a maximum velocity of 20m. s^-1. Which vehicle between the van and police car will be ahead at the time of 10m. s^

the bal will not change its velocity.

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.

not too sure thinking all accelerations are pointed down