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Ep₁ + Ek₁ = Ep₂ + Ek₂
mgh₁ + 1/2mv₁² = 0 + Ek₂
mgh₁ + 1/2mv₁² = Ek₂
Ek₂ = (4 x 10 x 5) + (1/2 x 4 x 12²)
Ek₂ = 200 + 288
Ek₂ = 488J