Предмет: Физика, автор: denispetrushko

Движение материальной точки задано уравнением s=t+0.4t^2. Точка будет иметь скорость 9м/с через:

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Автор ответа: DedStar

Скорость - первая производная от координаты:
V = 1 + 0,8*t
9 = 1 + 0,8*t
t = 8 / 0,8 = 10 c

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