If an object travels around a 200m long track in 2 seconds what is the objects speed and velocity?

100m/s

Explanation:

in this question it does not specify the direction for a vector quantity .so in this question the velocity and the speed is considered the same.

Speed=d/t=200/2=100m/s

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.