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vf^2= vi^2 + 2ad
vf^2 = (0) +2 (9.8 m/s^2)( 15m)
vf = raiz de 294 m^2/s^2
vf= 17. 14 m/s
a) vf= vi + a t
17.14 m/s = 0 + 9.8 m/s^2 t
t= 17.14 m/s / 9.8 m / s^2
t= 1.74 s
vf^2= vi^2 + 2ad
vf^2 = (0) +2 (9.8 m/s^2)( 15m)
vf = raiz de 294 m^2/s^2
vf= 17. 14 m/s
a) vf= vi + a t
17.14 m/s = 0 + 9.8 m/s^2 t
t= 17.14 m/s / 9.8 m / s^2
t= 1.74 s
espero que te sirva