Answer
$x=90m$
Work Step by Step
We know the following equation:
$v_{f}^{2}=v_{0}^{2}+2ax$
$=\frac{v_{f}^{2}-v_{0}^{2}}{2a}$
We plug in the known values to obtain:
$x=\frac{(30m/s)^{2}-(0m/s)^{2}}{2(5m/s^{2})}=90m$
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