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Datos:
y=(3*4)=12
vo=0m/s
g=9.8m/s2
Formula:
y=vot-1/2gt2
y=-1/2gt2 despejando t
t2=(-2*y)/g
sacas raiz cuadrada
t=raiz(-2*-12)/9.8
t=1.56s
vf=vo-gt
sustituyes valores
vf=-9.8*1.56
vf=-44.68