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Los datos son:
m = 1294 kg
v = 50 km/h
Ec = ?
Convertimos las unidades al SI
v = (50 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 13,89 m/s
Calculamos la energía cinética.
Ec = 1/2 (m) (v)²
Ec = 1/2 (1294 kg) (13,89 m/s)²
Ec = 647 kg (192,93 m²/s²)
Ec = 124,825.71 Joules----------------Respuesta