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h=400m
g=9.8m/s^2
Vf=0
V=?
Solución
Vf^2=Vi^2-2gh
0=Vi^2-2gh
Vi^2=2gh
Vi=√[2gh]
Vi=√[2(9.8)(400)]
Vi=√[19.6x400]
Vi=√[7840]
Vi=88.54m/s
Saludos...