যদি একটি গাড়ির গতি $2 m s^{- 1}$ বৃদ্ধি পায় এবং গতিশক্তি দ্বিগুণ হয় হবে গাড়ির প্রকৃত বেগ কত হবে?

Created: 9 months ago | Updated: 1 month ago

(\sqrt{2} + 1) m s^{- 1}

\sqrt{2} (\sqrt{2} + 1) m s^{- 1}

2 (\sqrt{2} - 1) m s^{- 1}

2 (\sqrt{2} + 1) m s^{- 1}

448

ABC ত্রিভুজের ক্ষেত্রে $a^{4} + b^{4} + c^{4} = 2 c^{2} (a^{2} + b^{2})$ হলে cos C এর মান হবে

Created: 3 months ago | Updated: 1 month ago

\frac{1}{\sqrt{2}}

\pm \frac{1}{\sqrt{2}}

\pm \frac{\sqrt{3}}{2}

None

485

Created: 3 months ago | Updated: 1 month ago

(\frac{3.5}{6}, \frac{\sqrt{3}}{4}) o r (\frac{\sqrt{3}}{4}, \frac{3.5}{6})

(\frac{6}{3.5}, \frac{4}{\sqrt{3}}) o r (\frac{6}{3.5}, \frac{4}{\sqrt{3}})

(\frac{3.5}{4}, \frac{6}{4}) o r (\frac{6}{4}, \frac{3.5}{4})

(\frac{\sqrt{3}}{3.5}, \frac{2}{3}) o r (\frac{2}{3}, \frac{\sqrt{3}}{3.5})

495

Created: 9 months ago | Updated: 1 month ago

\frac{1}{14} [\begin{matrix} 6 & 4 \\ - 2 & 1 \end{matrix}]

\frac{1}{14} [\begin{matrix} - 6 & - 4 \\ 2 & 1 \end{matrix}]

\frac{1}{14} [\begin{matrix} 6 & 4 \\ - 2 & - 1 \end{matrix}]

\frac{1}{- 14} [\begin{matrix} - 6 & - 4 \\ 2 & 1 \end{matrix}]

None

337

Created: 9 months ago | Updated: 1 month ago

0 °

45 °

95 °

90 °

None

348

Created: 3 months ago | Updated: 1 month ago

1 M

4 m

\frac{22}{7} m

2 m

771