v0-начальная скорость 72км/ч=20м/c
<span>м-коэффициент трения 0.2</span>
<span><span>m-масса автомобиля</span></span>
<span><span><span>S-тормозной путь</span></span></span>
<span>Ек=Атр</span>
<span><span>Ек=m*v0^2/2</span></span>
<span><span><span>Aтр=Fтр*S</span></span></span>
<span><span><span><span>m*v0^2/2=м*m*g*S</span></span></span></span>
<span><span><span><span><span>v0^2/2=м*g*S</span></span></span></span></span>
<span><span><span><span><span><span>S=v0^2/2м*g</span></span></span></span></span></span>
<span><span><span><span><span><span><span>S=400/2*0,2*10=100 м</span></span></span></span></span></span></span>
<span><span><span><span><span><span><span>Ответ: 100 м.</span></span></span></span></span></span></span>