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EM₁ = EM₂
Ep₁ + Ek₁ = Ep₂ + Ek₂
mgh₁ + ½mv₁² = mgh₂ + ½mv₂²
(1) (10) (100) + ½ (1) (20)² = (1) (10) (50) + ½ (1) v₂²
1000 + 200 = 500 + ½v₂²
½v₂² = 1000 + 200 - 500
½v₂²= 700
v₂² = 1400
v₂ = √1400
v₂ = 10√14 m/s
Jadi, kecepatan bola pada ketinggian 50 m adalah 10√14 m/s