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Datos :
Vo= 0
t= 4s
g= 9.8 m/s²
vf=?
h=?
Usamos la fórmula :
Vf= Vo+g*t
Al reemplazar datos :
Vf = 0 + 9.8 *4 s
Vf= 39.2 m/s²
Calculamos la altura :
h= * t
h= *4s
h= 19.6 m/s * 4s
h= 78.4 m
Saludos.