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Ek = ½ mv²
½v₁² = ½v₂²
Ek₁/m₁ = Ek₂/m₂
Ek₁/3m = 360/m
Ek₁/3 = 360/1
Ek₁ = 3 x 360
Ek₁= 1080 Joule
Jadi, energi kinetik bernda pertama adalah 1080 Joule