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v = g*t
V= 8*9,8= 78,4 m/s
g = 9.81 m/
Si el cuerpo lo dejas caer:
vf = vo + at
como lo dejamos caer : vo = 0 m/s
entonces
vf= 9.81 m// * t
Del dato:
t = 8s
Entonces:
vf= 9.81 m// * 8s
vf = 78.48 m/s