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ahora energia cinetica es 1/2m*v62=0.5*500*20^2=100.000 jouls
Por lo tanto: 72km/h = 72(1000m/3600s) = 72(5/18) m/s = 20m/s
Luego:
• Energia cinetica = Ek = (1/2)mV²
⇒ Ek = (1/2)(500kg)(20m/s)²
⇒ Ek = 100 000 Joules ← Respuesta
Eso es todo!!