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Консультация № 87796
20.05.2007, 20:06
0.00 руб.
0
3
3
Здравствуйте, уважаемые эксперты! Помогите пожалуста решить задачку:
Мальчик стоит на абсолютно гладком льду и бросает мяч массой 0,5 кг. С какой скоростью после броска начинает скользить мальчик, если горизонтальная составляющая скорости мяча равна 5м/с, а масса мальчика равна 20 кг?
Мальчик стоит на абсолютно гладком льду и бросает мяч массой 0,5 кг. С какой скоростью после броска начинает скользить мальчик, если горизонтальная составляющая скорости мяча равна 5м/с, а масса мальчика равна 20 кг?
Обсуждение
Неизвестный
20.05.2007, 20:47
общий
это ответ
Здравствуйте, Spyro!
Записываем закон сохранения импульса
m1V1+m2V2=m1V12+m2V22
До броска импульс был равен нулю, значит
0=m1V12+m2V22
Определяем знаки
0=m1V12-m2V22
m1V12=m2V22
Выражаем V человека
V12=m2V22/m1
Считаем v12=2,5/20=1/8
Записываем закон сохранения импульса
m1V1+m2V2=m1V12+m2V22
До броска импульс был равен нулю, значит
0=m1V12+m2V22
Определяем знаки
0=m1V12-m2V22
m1V12=m2V22
Выражаем V человека
V12=m2V22/m1
Считаем v12=2,5/20=1/8
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