Предмет: Физика, автор: myrk0tik

Николаю необходимо добраться на машине в Санкт-Петербург за 10 часов. С какой минимальной средней скоростью он должен ехать, если длина выбранной им дороги 740 км?

Ответы

Автор ответа: VоЛk

Дано:

Max t = 10 часов

l = 740 км

min v ср. - ?

Из формулы скорости тела:

$v = \dfrac{l}{t}$

Стоит отметить, что минимальная возможная средняя скорость будет только тогда, когда тело будет двигаться максимальное количество времени.

Поэтому вместо t в формулу подставляем 10 часов, а вместо l - 740 км, и находим среднюю скорость:

$v = \dfrac{740}{10} = 74$

Размерность скорости в данной задаче - км/час

(Стоит отметить, что перевод в системные единицы в данной задаче не требуется)

Ответ: 74 км/час

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