На рисунке 152 график зависимости модуля вектора магнитной индукции магнитного поля, пронизывающего замкнутый контур, от времени. в какие промежутки времени индукционный ток в контуре отсутствовал

V = 54 км в час = 54*1000/3600 = 15 м в сек
mv²/2 = FтрS = mgkS
S = v²/2gk = 225/2*10*0.5 = 22.5 м
С другой стороны
S = at²/2 = (Fтр/m)t²/2 = gkt²/2 = 10*0.5*16/2 = 80/2 = 40 м
Ну, значит, либо коэф. трения не 0,5. Либо время торможения не 4 с.
Если начальная скорость 15 м в сек и коэф трения 0,5, то время торможения должно быть
t = v/a = v/gk = 15/10*0.5 = 15/5 = 3 секунды. А вовсе не 4.
Тогда всё сойдётся:
S = at²/2 = (Fтр/m)t²/2 = gkt²/2 = 10*0.5*9/2 = 45/2 = 22,5 м
Похоже, что задача внутренне противоречива. Возможно, неточно указано время торможения при таких начальных скоростях и коэффициенте трения.

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