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m = 1000kg
v = 72 km/h = 20 m/s
Ek = mv²/2 [ kg × m/s × m/s = kg × m × m : s² = N × m = J ]
Ek = 1000 × 20² : 2 = 1000 × 400 :2 = 400 000 : 2 = 200 000J = 200kJ