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Maaf kalo salah ya
H = 100cm = 1 m
g = 10m/s^2
E = energi yang dikeluarkan Dimas
m = 12,5 kg
Hukum kekekalan energi
Em awal = Em akhir
mgh + E = mgH
E = mg ( H-h )
E = 12,5 10 ( 1 - 0,2 )
E = 125 0,8
E = 100 J