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Los datos que tiene sson:
m = 1000 kg
v = 80 km/h
Ec = ?
Convertimos las unidades al SI
v = (80 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 22,22 m/s
Calculamos
Ec = 1/2 mv²
Ec = 1/2 (1000 kg) (22,22 m/s)²
Ec = 500 kg (493,72 m²/s²)
Ec = 246860 Julios-------------------------Respuesta