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Usaha dan Energi- Energi Kinetik
m = 400 g = 0,4 kg
v = 60 m/s
Ek = ..... ?
Ek = ½ m v²
Ek = ½ × 0,4 × 60²
Ek = 0,2 × 3600
Ek = 720 J