Asteady 45 n horizontal force is applied to a 15 kg object a table. the object slides against a friction force of 30 n. calculate the acceleration of the object in m/s.

The net force on an object subject to friction is equal to the sum of the applied force and the frictional force.

Mathematically,

Here, m is mass of object and a is its acceleration. We take frictional force negative because it opposes the motion of object.

Given, , and

Substituting these values in above formula, we get

.

Thus, the acceleration of an object is

the answer is d. 4

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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.