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Los datos que tienes son:
m = 800 kg
v = 300 km/h
Ec = ?
Convertimos las unidades al SI
v = (300 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 83,33 m/s
Calculamos la energía cinética
Ec = 1/2 mv²
Ec = 1/2 (800 kg) (83,33 m/s)²
Ec = 400 kg (6943,88 m²/s²)
Ec = 2777552 Joules
Respuesta.
Ec = 2777552 Joules