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h = 3 m
g = 9 m/s2
v0 = 10 m/s
Em = ...
Em = Ep + Ek
Ep = mgh
Ep = 5 kg x 3 m x 9 m/s2
Ep = 135 Joule
Pada saat benda berada di titik puncak, Ek = 0.
Dalam Hukum Kekelaan Energi, energi mekanik sebuah benda selalu sama.
Jadi,
Em = Ep + Ek
Em = 135 J + 0 J
Em = 135J