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Em₁ = Ep₂ + Ek₂
1 = Ep₂/Em₁ + Ek₂/Em₁
sin² α + cos² α = Ep₂/Em₁ + Ek₂/Em₁
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sin² α = Ep₂/Em₁
Ep₂ = Em₁ sin² α
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cos² α = Ek₂/Em₁
Ek₂ = Em₁ cos² α
Ek₂ = Em₁ cos² 60°
Ek₂ = 400 1/4
Ek₂ = 100 Joule
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