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Ec2=1/2m·(2v)²=1/2m·4v²
Ec/Ec1=v²/4v²⇒Ec/Ec1=1/4⇒4Ec=Ec1⇒4·12=48 Julios.
Luego como W=ΔEc=Ecf-Eci=48-12=36 Julios.