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Los datos que te dan son:
m = 9 kg
v = 36 km/h
Ec = ?
Conviertes los km/h a m/s, es decir al SI
v = (36 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 10 m/s
Calculamos la energía cinética.
Ec = 1/2 mv²
Ec = 1/2 (9 kg) (10 m/s)²
Ec = 4,5 kg (100 m²/s²)
Ec = 450 Joules--------------Respuesta