Question

решите пожалуйстааааааа​

Answer 1

Ответ:

180 000

Пошаговое объяснение:

$5 * \sqrt{1 - \frac{v^2}{9 * 10^{10}} } = 4 \\\sqrt{1 - \frac{v^2}{9 * 10^{10}} } = \frac{4}{5} \\\sqrt{1 - \frac{v^2}{9 * 10^{10}} } = 0,8 \\1 - \frac{v^2}{9 * 10^{10}} = 0,64 \\\frac{v^2}{9 * 10^{10}} = 1 - 0,64 \\\frac{v^2}{9 * 10^{10}} = 0,36 \\\frac{v^2}{9 * 10^{10}} = 0,6^2 \\\frac{v^2}{(3 * 10^{5})^2} = 0,6^2 \\( \frac{v}{3 * 10^5} ) ^ 2 = 0,6 ^2 \\\frac{v}{3 * 10^5} = 0,6 \\v = 3 * 10^5 * 0,6\\v = 180000$

Answer 2

Пошаговое объяснение:

$\[\begin{gathered}5\sqrt {1-\frac{{{v^2}}}{{9*{{10}^{10}}}}}=4\hfill \\5\sqrt {\frac{{9*{{10}^{10}}}}{{9*{{10}^{10}}}}-\frac{{{v^2}}}{{9*{{10}^{10}}}}}=4\hfill \\5\sqrt {\frac{{9*{{10}^{10}}-{v^2}}}{{9*{{10}^{10}}}}}=4\hfill \\5\frac{{\sqrt {9*{{10}^{10}}-{v^2}} }}{{\sqrt {9*{{10}^{10}}}}}=4 \hfill \\5\frac{{\sqrt {9*{{10}^{10}}-{v^2}} }}{{3*{{10}^5}}} = 4 \hfill \\ \end{gathered} \]$

$\[\begin{gathered}\frac{{\sqrt {9*{{10}^{10}}-{v^2}} }}{{3*{{10}^5}}} =\frac{4}{5}\hfill \\\sqrt {9*{{10}^{10}}-{v^2}}=\frac{{3*{{10}^5}*4}}{5} \hfill \\\sqrt {9*{{10}^{10}}-{v^2}}=\frac{{12*{{10}^5}}}{5} \hfill \\\sqrt {9*{{10}^{10}}-{v^2}}=2.4*{10^5}\hfill\\ \end{gathered}\]$

$\[\begin{gathered}{\left( {\sqrt {9*{{10}^{10}}-{v^2}}}\right)^2} = {(2.4*{10^5})^2}\hfill \\9*{10^{10}}-{v^2}=5.76*{10^{10}} \hfill \\{v^2} = 9*{10^{10}}-5.76*{10^{10}} \hfill \\{v^2}=3.24*{10^{10}} \hfill \\\boxed{v=\pm 1.8*{{10}^5}}\hfill\\ \end{gathered} \]$