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15.27: Енергія та імпульс
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\( p_{x}=mu_{x}=\frac{m_{0}u_{x}}{\left(1-\frac{u_{x}^{2}}{c^{2}}\right)^{\frac{1}{2}}}\)і\( p'_{x'}=m'u'_{x'}=\frac{m_{0}u'_{x'}}{\left(1-\frac{u_{x'}^{2}}{c^{2}}\right)^{\frac{1}{2}}}\). Також\( u'_...\( p_{x}=mu_{x}=\frac{m_{0}u_{x}}{\left(1-\frac{u_{x}^{2}}{c^{2}}\right)^{\frac{1}{2}}}\)і\( p'_{x'}=m'u'_{x'}=\frac{m_{0}u'_{x'}}{\left(1-\frac{u_{x'}^{2}}{c^{2}}\right)^{\frac{1}{2}}}\). Також\( u'_{x'}=\frac{u_{x}-v}{\left(1-\frac{u_{x}^{2}}{c^{2}}\right)}\), з якого\( \left(1-\frac{u'^{2}_{x'}}{c^{2}}\right)^{\frac{1}{2}}=\frac{\left(1-\frac{u_{x}^{2}}{c^{2}}\right)^{\frac{1}{2}}\left(1-\frac{v^{2}}{c^{2}}\right)^{\frac{1}{2}}}{1-\frac{u_{x}v}{c^{2}}}\).