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Консультация № 196259
30.08.2019, 15:22
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Здравствуйте! Прошу помощи в следующем вопросе:
Лёгкий шарик падает с высоты h с нулевой начальной скоростью. В нижней точке траектории по шарику ударяют снизу вверх ракеткой, движущейся со скоростью v0 . На какую высоту H подпрыгнет шарик?
Соударение считайте упругим, сопротивление воздуха – пренебрежимо малым. Масса ракетки во много раз больше массы шарика.
Лёгкий шарик падает с высоты h с нулевой начальной скоростью. В нижней точке траектории по шарику ударяют снизу вверх ракеткой, движущейся со скоростью v0 . На какую высоту H подпрыгнет шарик?
Соударение считайте упругим, сопротивление воздуха – пренебрежимо малым. Масса ракетки во много раз больше массы шарика.
Обсуждение
01.09.2019, 13:45
общий
это ответ
Здравствуйте, irinasoboleva76!
Шарик достигает ракетки, падая со скоростью v1=[$8730$](2gh)
Он ударяется о ракетку с относительной скоростью v1+v0, и отскакивает при упругом ударе с такой же относительной скоростью.
В исходной системе отсчёта скорость шарика после удара будет v2=v1+2v0=2v0+[$8730$](2gh)
Он поднимется на высоту
H=v22/2g=2v02/g+2v0[$8730$](2h/g)+h
Шарик достигает ракетки, падая со скоростью v1=[$8730$](2gh)
Он ударяется о ракетку с относительной скоростью v1+v0, и отскакивает при упругом ударе с такой же относительной скоростью.
В исходной системе отсчёта скорость шарика после удара будет v2=v1+2v0=2v0+[$8730$](2gh)
Он поднимется на высоту
H=v22/2g=2v02/g+2v0[$8730$](2h/g)+h
5
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