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satela [25.4K]
3 years ago
7

Most of the universe is believed to be ______

Physics
2 answers:
vivado [14]3 years ago
6 0

Answer:

B. dark matter

Explanation:

The<u> current theory</u> is that the dark matter composes about 85% of the matter in the whole universe, possibly in large majority made out of unknown material.  What we found so far is that the majority of the dark matter is NOT composed of baryonic material (the stuff that makes stars and planet).

We know dark matter exists and we suppose there's a HUGE amount of it that fills the gaps between stars and planets.  

Minchanka [31]3 years ago
6 0

The answer would be B.dark matter

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At time 10.28 s after A is fired bullet B passes A.

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Let h be the height at which this occurs and t be the time after second bullet fires.

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s=ut+0.5at^2 \\

Here s = h,u = 450m/s a = -g and t = t+3

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h=450(t+3)-0.5\times 9.81\times (t+3)^2=450t+1350-4.9t^2-29.4t-44.1\\\\h=420.6t-4.9t^2+1305.9

Distance traveled by second bullet

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Substituting

h=600t-0.5\times 9.81\times t^2=600t-4.9t^2\\\\h=600t-4.9t^2 \\

Solving both equations

600t-4.9t^2=420.6t-4.9t^2+1305.9\\\\179.4t=1305.9\\\\t=7.28s \\

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