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vf =15m/s+9,8m/s^2*3s
vf=15m/s+29,4m/s=44,4m/s
vi = 28 m/s
g = 9,8 m/s²
t = 5s
vf = ?
Calculamos la rapidez que tiene.
vf = vi + gt
vf = 28 m/s + (9,8 m/s²) (5s)
vf = 28 m/s + 49 m/s²
vf = 77 m/s
La velocidad es 77 m/s