Solution 18.4a
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(New page: <math>\begin{align} & v=\frac{ds}{dt}=36t-3{{t}^{2}} \\ & a=\frac{dv}{dt}=36-6t \\ & 36-6t=0 \\ & t=\frac{36}{6}=6\text{ s} \\ \end{align}</math>)
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\displaystyle \begin{align} & v=\frac{ds}{dt}=36t-3{{t}^{2}} \\ & a=\frac{dv}{dt}=36-6t \\ & 36-6t=0 \\ & t=\frac{36}{6}=6\text{ s} \\ \end{align}