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| (a) | overrightarrowFtextA on BoverrightarrowFtextB on A | stands for | beginmatrix FtextA on Bx FtextB on Ax FtextA on By FtextB on Ay FtextA on Bz FtextB on Az endmatrix |
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| (b) | overrightarrowFtexttotaloverrightarrowF1overrightarrowF2ldots | stands for | beginmatrix Ftexttotalx F1xF2xldots Ftexttotaly F1yF2yldots Ftexttotalz F1zF2zldots endmatrix |
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| (c) | overrightarrowafracDelta overrightarrowvDelta t | stands for | beginmatrix ax Delta vx Delta t ay Delta vy Delta t az Delta vz Delta t endmatrix |
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