Solution 15.5b

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\displaystyle I=\text{ }0\textrm{.}\text{64} \ \text{Ns}\quad t=\text{ }0\textrm{.}\text{2}\ \text{s}

\displaystyle \begin{align} & \\ & I=Ft \\ & 0\textrm{.}64=F\times 0\textrm{.}2 \\ & F=3\textrm{.}2\text{ N} \end{align}