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Care este energia cinetica a unui elefant cu masa 4 tone si viteza 10m/s?

Răspuns :

4t=4000 kg

Ec=mv^2/2=4000 kg*(10 m/s)/2=4000 kg*100 m^2/s^2=4*10^5=4*10^5Ns^2/m*m^2/s^2=4*10^5 N*m=4*10^5 J=4*10^5:10^3=4*10^2=400 kJ