Answer
$$0.47 s$$
Work Step by Step
\begin{aligned}
&\text { From Equation } 2.4 \text {, we find: }\\
\frac{v-v_{0}}{a}=&t\\
&=>\frac{0 m / s-4.6 m / s}{-9.8 m / s^{2}}=t\\
&=>0.47 \mathrm{s}=t\\
\end{aligned}
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