Aroller coaster car moving at a velocity of 30 meters/second has a momentum of 2.5 x 10^4 kilogram meters/second. what is its mass?

We know that in physics the momentum of an object is defined as the product of mass by the velocity of the object.

That is to say:

Where P is the momentum = kilograms meters/second

m is the mass

v is the object velocity = 30 m/s

In this problem we have the momentum of the roller coaster and its speed, but we want to find its mass. Then we divide the momentum between speed.

The mass is 833.33 kg

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.