Предмет: Физика, автор: омар21

на сколько изменилась потенциальная энергия тела весом 2 кг при его падении с высотой 10 м до высоты 2 м?
А) увеличилась на 200 Дж
Б)увеличилась на 40 Дж
В) увеличилась на 160 Дж
Г) не изменилась

Ответы

Автор ответа: belozerova1955

ΔЕр = mg(h₂-h₁)
ΔEp = 2кг ·10м/с²· (2м - 10м) = -160Дж
"-" говорит о том, что энергия уменьшилась.

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