Đáp án:
77,16J
Giải thích các bước giải:
\[\begin{array}{l}v = 100km/h = \frac{{100}}{{3,6}}m/s\\{{\rm{W}}_d} = \frac{1}{2}m{v^2} = \frac{1}{2}.0,2.{\left( {\frac{{100}}{{3,6}}} \right)^2} = 77,16J\end{array}\]
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