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$6.7\times10^{-34}$ জুল
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$9.1\times10^{-31}$ জুল
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$1.06\times10^{-13}$ জুল
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$3.49\times10^{-13}$ জুল
$\mathrm{m}=\frac{\mathrm{m}_0}{\sqrt{1-\frac{\mathrm{v}^2}{\mathrm{c}^2}}}=\frac{\mathrm{m}_0}{\sqrt{1-\left(\frac{0.9 \mathrm{c}}{\mathrm{c}}\right)^2}}=2.294 \mathrm{~m}_0$
গতিশক্তি, $\mathrm{K}=\left(\mathrm{m}-\mathrm{m}_0\right) \mathrm{c}^2=\left(2.294 \mathrm{~m}_0-\mathrm{m}_0\right) \mathrm{c}^2$
$=1.294 \times 9.1 \times 10^{-31} \times\left(3 \times 10^8\right)^2 \mathrm{~J}=1.06 \times 10^{-13} \mathrm{~J}$