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72000m/h= 72000/3600 m/s (porque 1 hr=3600segs)
72000/3600 m/s=20m/s
la energía cinética es ½mv²
E= ½(5000)(20²)=2500(400)=1000000J=1000kJ=1MJ (J es de Joule 1kJ=1000J 1MJ=1000kJ)
Ec=1/2mv^2
reemplazando tenemos
Ec=1/2(5000)(20)^2
Ec1x10^6 Jouls