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alina1380 [7]
2 years ago
11

N2O is the chemical formula of a covalent compound used in the production of whipping cream. The elements that

Physics
1 answer:
WARRIOR [948]2 years ago
5 0

N₂O: Nitrous oxide

oxygen

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A hot air balloon is traveling vertically upward at a constant speed of 4.5 m/s. When it is 28 m above the ground, a package is
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Answer:

1.97 seconds

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

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s=ut+\frac{1}{2}at^2\\\Rightarrow 21=4.5t+\frac{1}{2}\times -9.8\times t^2\\\Rightarrow 21=-4.5t-4.9t^2\\\Rightarrow 4.9t^2+4.5t-28=0\\\Rightarrow 49t^2+45t-280=0

Solving the above equation we get

t=\frac{-45+\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}, \frac{-45-\sqrt{45^2-4\cdot \:49\left(-280\right)}}{2\cdot \:49}\\\Rightarrow t=1.97, -2.89

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