chore(i18n,learn): processed translations (#44866)
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id: 5900f4aa1000cf542c50ffbc
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title: 'Problem 317: Firecracker'
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title: '問題 317: 爆竹'
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challengeType: 5
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forumTopicId: 301973
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dashedName: problem-317-firecracker
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# --description--
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A firecracker explodes at a height of 100 m above level ground. It breaks into a large number of very small fragments, which move in every direction; all of them have the same initial velocity of 20 $\frac{\text{m}}{\text{s}}$.
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ある爆竹は地上 100 m の高さで爆発します。 爆発すると、無数の微小な破片に分かれてあらゆる方向に飛び散ります。いずれの破片も初速は 20 $\frac{\text{m}}{\text{s}}$ です。
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We assume that the fragments move without air resistance, in a uniform gravitational field with $g=9.81 \frac{\text{m}}{\text{s}^2}$.
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$g=9.81 \frac{\text{m}}{\text{s}^2}$ の一様な重力場で、破片が空気抵抗を受けずに動くと仮定します。
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Find the volume (in $\text{m}^3$) of the region through which the fragments move before reaching the ground. Give your answer rounded to four decimal places.
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破片が地面に到達する前に移動する領域の体積 ($\text{m}^3$) を求めなさい。 回答は、四捨五入して小数第 4 位まで示すこと。
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# --hints--
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`firecracker()` should return `1856532.8455`.
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`firecracker()` は `1856532.8455` を返す必要があります。
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```js
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assert.strictEqual(firecracker(), 1856532.8455);
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