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Tambahan = 4050 - 2.700 = 1350 J
W₁ / t₁ = W₂ / t₂
2700 / 30 = W₂ / 45
2700 3 / 2 = W₂
W₂ = 4050 Joule
Energi yang dibutuhkan = W₂ - W₁ = 4050 - 2700 = 1350 Joule