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Datos que tienes:
m = 1200 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 (600 kg) (22,22 m/s)²
Ec = 600 kg (493,73 m²/s²)
Ec = 296238 Joules
Respuesta.
Ec = 296238 Joules