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Los datos que tienes son:
m = 5,1 kg
v = 2 m/s
Ec = ?
Calculamos la energía cinética.
Ec = 1/2 (m) (v)²
Ec = 1/2 (5,1 kg) (2 m/s)²
Ec = 2,55 kg (4 m²/s²)
Ec = 10,2 Joules
Respuesta.
La energía cinética es: 10,2 Joules