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Los datos que te dan son:
m = 2 kg
v = 5 m/s
Ec = ?
Calculamos la energía cinética
Ec = 1/2 mv²
Ec = 1/2 (2 kg) (5 m/s)²
Ec = 1 kg (25 m²/s²)
Ec = 25 Joules
Respuesta
Ec = 25 Joules