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v=60km/h=16,6m/s
przy predkosci 30km/h=8,3m/s
obliczam mase
m=2Ek/v²
m=2*40000/8.3²
m=1161kg
przy predkosci 16,6m/s
Ek=½*1161*16.6½
Ek=159962,6J