Предмет: Физика, автор: АнгелСмерти2000

Робин Гуд выстрелил из лука под углом 60° к горизонту. Стрела в момент
начала движения имела скорость 40 м/с. Найдите проекцию скорости стрелы
на горизонтальную ось.Напишите подробно(распишите) пожалуйста

Ответы

Автор ответа: nickeya

Если стрелу выпускают под углом к горизонту, то ее скорость можно разложить на горизонтальную и вертикальную составляющую.
При этом, горизонтальная составляющая Vг=Vо*cosα, а вертикальная Vв=Vo*sinα (по свойству прямоугольного треугольника, где отношения прилежащего катета к гипотенузе есть косинус, а противолежащего - синус).
Тогда Vг=Vo*cos 60 градусов = 40 м/с * 1/2 = 20 м/с

Автор ответа: nickeya

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