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m=0,5 kg
v=72 km/h = 20 m/s
Szukane - enargia kinetyczne ciała
E=mv²/2
E=0,5×400/2 = 100 J
m=0,5 kg
v=72 km/h=20 m/s
Ek=½*0,5*20²
Ek=0,25*400
Ek=100 J