Сравните работу A1 и A2, которую необходимо выполнить, чтобы повысить скорость тела от 0 до υ и от υ до 3 υ .
A2=6A1
A1=A2
A2=9A1
A2=8A1
A2=6A1
A1=A2
A2=9A1
A2=8A1
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A1 = ΔEk1 = (m v²)/2A2 = ΔEk2 = (m 9v²)/2 - (m v²)/2 = (m/2) * (9v² - v²) = 4 mv²
A2 / A1 = (4 mv²) * (2/(mv²)) = 8,
A2 = 8 A1.