Предмет: Физика, автор: kanunnikovdanil81

Тілчомуо падає з висоти 20 м. Визначте, дорівнює швидкість тіла в момент падіння на поверхню Землі.
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Ответы

Автор ответа: zinovicgrigorij

Ответ: 20м/с

Объяснение: при свободном падении скорость равна: V=Vо+gt, где: Vо-начальная скорость, g-ускорение свободного падения, t-время падения. В нашем случае Vо=0.

Тогда V=gt;

Высота, с которой падает тело, определяется по формуле: h=Vо*t+gt²/2; t=√2*h/g=√2*20/10=√4=2c

V=10*2=20м/c

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PAUL BROWN'S DAILY ROUTINE

Friday morning. The alarm clock goes off at 7. Paul usually gets up easily but not this time. It’s not simple to wake up so early if you go to bed at 3 in the morning. He can hardly open his eyes. Half an hour passes before Paul finally makes himself get up. He is still sleepy. He slowly gets dressed and looks out of the window. It’s drizzling1 and the sidewalk is wet. There’s nobody in sight2. The campus looks deserted. But Paul goes jogging every morning, whatever the weather3. He sighs4, puts on his sneakers and goes out. Twenty minutes later he comes back and takes a long shower. As usual jogging and a cold shower do him good. He is wide awake now. Paul looks at the clock. It’s 8.15. Time for breakfast. He goes to the kitchen to make coffee. A cup of coffee is always reviv¬ing5, especially after the party like yesterday’s. He smiles at the thought of that delicious birthday cake. But the smile vanishes6 the moment he remembers his schedule for today. He’s got three classes on Friday.
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