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v = 48 km/h = 48*1000/3600 m/s = 13 ⅓ m/s
m = 9 kg
Ek = m*v² /2
Ek = 9 kg * (13⅓)² / 2
Ek = 4,5 kg* (40/3) m²/s²
Ek = 4,5 kg * 1600/9 m²/s²
Ek = 7200 / 9
Ek = 800 J