In 20 minutes, kara ran 2.40 km on a treadmill facing due east. relative to the gym, what were her displacement and average velocity during this time interval?

Displacement is zero.

Average velocity 7,2 km/hr

Explanation:

In order to calculate the average velocity we just ahve to do a simple rule of three, where 20 minutes is divided by 2,4 kilometers, so how much would she advance in 60 minutes?:

So her average veocity will be 7.2 km/hr

And her displacement will be zero because she was on a treadmill so her location didn´t change at all.

measuring things 1 litre of water

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.