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50g --> 0.05kg
Ec inicial= (0.05)(16)^2/2
Ec inicial = 6.5 Joules
Ec final = (0.05)(10)^2/2
Ec final = 2.5 Joules
Cambio = final - inicial
Cambio = 2.5 - 6.5
Cambio = -4 Joules
:)