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= 0,4 kg ×10 m/s² × ( 5 m - 3m )
= 8 J
m = massa
g = percepatan gravitasi
h = ketinggian
2. Ek = 1/2 mv²
= 1/2 × 8000 kg × 20² m/s
= 1.600.000 J
3.°R = 4/5 ×80°C
= 64 °R