Предмет: Физика, автор: Аноним

50 БАЛЛОВ!!!!!За одну задачкуПоезд в течении 10 сек. увеличил скорость с 36 до 54 км. ч. , а затем 0.3 мин. двигался равномерно. Найдите среднюю скорость и пройденный путь.ЛЮДИ, ТОЛЬКО С ОБЪЯСНЕНИЯМИ ПОЖАЛУЙСТА.

Ответы

Автор ответа: love2233
0
ответ дан во вложении там все правильно удачи получать 5
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Автор ответа: Аноним
0
А ты знаешь где скачать решения к задачнику по физике за 9-11 классы «Физика. 9-11 класс. Пособие для общеобразовательных учебных заведений» Степанова Г. Н
Автор ответа: love2233
0
нет не знаю
Автор ответа: MashaPutnaj
0
Дано V1=10 м/с   V2=54 км/ч=15 м/с   t1=10 с    t2=18 с   Vср- ?

Начертим график скорости
В начале скорость возрастает а потом скорость не меняется 
.
Известно что пройденный путь равен площади фигуры под графиком скорости

S1= (V1+V2)*t1/2=(10+15)*10/2=125 м
S2=V2*t=15*18=270 м

Vср=S/t=(S1+S2)/(t1+t2)=395/28=14,107 м/с

Ответ Vср=14,1 м/с
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