Предмет: Физика, автор: holiday16052004

Помогите, пожалуйста ❤️

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Ответы

Автор ответа: fatt52

Ответ:

Объяснение:

m=3000 кг vo=15 м/с (из графика) А=?

===

1 способ

Закон сохранения энергии

A=m*vo²/2=3000*15²/2=337500 Дж

2 способ

A=F*s

F=m*a

s=(v²-vo²)/(2*a) (а - отрицательное при торможении)

v=0

тогда s=vo²/(2*a)

Получаем всё равно A=m*vo²/2=337500 Дж

=========================

holiday16052004: А если выбрать 1 способ, разве не нужно вычитать из m*V0²/2-m*V1²=337500-150000=187500? При условии V1=10

fatt52: Торможение происходит до момента, когда скорость становится равной нулю.

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