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g = 10m/s²
h₁ = 10m
h₂ = 4m
⇒ Hitung Ep
Ep₁ = m.g.h₁
= 5kg x 10m/s² x 10m
= 500 J
Ep₂ = m.g.h₂
= 5kg x 10m/s² x 4m
= 200 J
⇒ Hitung Ek
Tanpa kecepatan awal, maka
Ek₁ = 0
⇒ Hukum Kekekalan Momentum
Em₁ = Em₂
Ep₁ + Ek₁ = Ep₂ + Ek₂
500J + 0 = 200J + Ek₂
Ek₂ = 500J - 200J
Ek₂ = 300 Joule.