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Консультация № 103366
25.09.2007, 18:22
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Здравствуйте уважаемые эксперты!!! Помогите решить следущую задачу:
Пловец, спрыгнув с пятиметровой вышки, погрузился в воду на глубину 2 метра. Сколько времени и с каким ускорением он двигался в воде?
P.S.:Учусь в 10 классе.
Пловец, спрыгнув с пятиметровой вышки, погрузился в воду на глубину 2 метра. Сколько времени и с каким ускорением он двигался в воде?
P.S.:Учусь в 10 классе.
Обсуждение
Неизвестный
25.09.2007, 21:11
общий
это ответ
Здравствуйте, Торгов Иван Владимирович!
сначала найдем скорость при входе в воду. V=gt, S=gt^2/2, t^2=2S/g. t полета 1 секунда. V=10. S=at^2/2, V=at. решаем систему:
2=аt^2/2
10=at.
a=10/t. подставляем
отсюа а=28, t=0,4
сначала найдем скорость при входе в воду. V=gt, S=gt^2/2, t^2=2S/g. t полета 1 секунда. V=10. S=at^2/2, V=at. решаем систему:
2=аt^2/2
10=at.
a=10/t. подставляем
отсюа а=28, t=0,4
Неизвестный
27.09.2007, 16:39
общий
это ответ
Здравствуйте, Торгов Иван Владимирович!
Скорость пловца в момент контакта с водой равна:
V0=sqrt(2*g*H);
sqrt – корень квадратный
H – высота вышки
Пройдя 2 метра он остановился, значит:
h=(V1^2-V0^2)/(2*a);
V1=0;
a=-V0^2/(2*h);
Знак «-» свидетельствует о том, что скорость пловца будет уменьшаться.
Тогда время движения:
h=(V1-V0)*t/2;
t=2*h/V0;
Скорость пловца в момент контакта с водой равна:
V0=sqrt(2*g*H);
sqrt – корень квадратный
H – высота вышки
Пройдя 2 метра он остановился, значит:
h=(V1^2-V0^2)/(2*a);
V1=0;
a=-V0^2/(2*h);
Знак «-» свидетельствует о том, что скорость пловца будет уменьшаться.
Тогда время движения:
h=(V1-V0)*t/2;
t=2*h/V0;
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