A child and sled with a combined mass of 57.0 kg slide down a frictionless slope. If the sled starts from rest and has a speed of 2.40 m/s at the bottom, what is the height of the hill?

The height of the hill is 29.3 cm.

Explanation:

Given that,

The combined mass of a child and sled, m = 57 kg

Initial speed of the sled, u = 0

Speed at the bottom of the sled, v = 2.4 m/s

We need to find the height of the hill. The energy at the bottom and the top will remains the same due to the law of conservation of energy. So,

So, the height of the hill is 29.3 cm. Hence, this is the required solution.

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.

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