Solution 3.9a

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<math>\begin{align}
<math>\begin{align}
& \uparrow \ R-mg=0 \\
& \uparrow \ R-mg=0 \\
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& R=200\times 9.8=1960\ \text{N} \\
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& R=200\times 9\textrm{.}8=1960\ \text{N} \\
\end{align}</math>
\end{align}</math>

Current revision

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\displaystyle \begin{align} & \uparrow \ R-mg=0 \\ & R=200\times 9\textrm{.}8=1960\ \text{N} \\ \end{align}

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