A81 kg man lying on a surface of negligible friction shoves a 79 g stone away from himself, giving it a speed of 4.5 m/s. what speed does the man acquire as a result?

The speed of the man is 4.54 m/s.

Explanation:

Given that,

Mass of man=8100 g

Mass of stone = 79 g

Speed  = 4.5 m/s

We need to calculate the speed of the man

Using momentum of conservation

Where,

=mass of man

=mass of stone

=velocity of man

=velocity of stone

Put the value in the equation

As the stone is away from the man

So, the speed of stone is zero

Hence, The speed of the man is 4.54 m/s.

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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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.