Предмет: Математика, автор: iljinvitaly201

найти энергию тела(25кг) через 4 сек.после нач.движения,закон движения такой:S=3t²-1

Ответы

Автор ответа: xxxeol

E = mV²/2 - энергия
S = 3t²- 1 - путь
V= t³ - t - интеграл пути
V(4) = 64 -4 = 60 - скорость на 4 секунде.
E = 25*60²/2 = 12.5*3600 = 45 000 - ОТВЕТ

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