Respostas

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2013-11-18T23:01:08-02:00
72 km/h → 20 m/s

V=Vo+at
20=0+a40
20=40a
a= \frac{20}{40}

a=0.5 m/s²

F=m.a
F=5000.0.5
F=2500 N

S=S_o+v_0t+ \frac{at^{2}}{2}

S=0+0+ \frac{0,5.40^2}{2}

S= \frac{0,5.40^2}{2}

S= \frac{800}{2}

\boxed{S=400~m}
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