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Mobil A ⇒E.k = 1/2 massa . 9² = 81. 1/2 massa
Mobil B ⇒E.k = 1/2 massa . 16² = 256 . 1/2 massa
Mobil A : Mobil B = 81. 1/2 massa : 256 . 1/2 massa (Dibagi 1/2 massa, karena massa mobil sama)
A : B = 81 : 256