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m=1000kg
v=72km/h
Ek=mvkwadrat/2
72km/h=20m/s
Ek=1000kg*(20m/s)kwadrat/2=1000kg*400mkwadrat/sekundakwadrat/2=400000J/2=200000J/2=200kJ
Ek=m*V²:2
Ek=1000kg*(20m/s)²:2
Ek=1000*400m/s:2
Ek=200000J
m = 1000 kg
V = 72 km/h = 20 m/s
Rozw :
Ek =m*v do kwadratu/2
Ek = 1000 * 20 do kwadratu /2 = 400000/2 = 200000 [ J]
Oblicz :
Ek