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danusia19935

Pociąg towarowy jechał przez most długości L=800m ze stałą prędkością 18km/h. Od chwili wjechania lokomotywy na most do chwili zjechania z mostu ostatniego wagonu upłynął czas 6 minut i 40 sekund. Oblicz długość pociągu.

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    L=800[m];
    V=18[km/h]/3.6=5[m/s];
    d-długość pociągu;
    t=6[min] i 40[s]=400[s];
    V=(L+d)/t
    Vt=L+d;
    d=Vt-L;

    d=5[m/s]*400[s]-800[m]=2000[m]-800[m]=1200[m].

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