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(0-xi)=-1/2 (9.8)(16)
-xi=-78.4
xi=78.4
vf2=vi2+2g(xf-xi)
vf2=-2(9.8)(0-78.4)
vf2=1536.64
vf=39.2
a) 78.4
b) 49.2
t = 4 seg
g = 9,8 m/s²
vo = 0
vf = ?
h = ?
altura
h = g.t² / 2
h = 9,8 m/s² * (4 seg)² / 2
h = 4,9 m/s² * 16 seg²
h = 78,4 m -------> solucion A)
velocidad al llegar al piso
vf = g .t
vf = 9,8 m/s² * 4 seg
vf = 39,2 m/s ------> solucion B)
saludos desde venezuela