Answer
$4.59\times 10^2~m/s$
Work Step by Step
$(3.21~m)/(7.00~ms)$
$= (3.21~m)/(7.00 \times 10^{-3}~s)$
$= 0.459\times 10^3~m/s$
$= 4.59\times 10^2~m/s$
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