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vf = 4 m/s
d = 40 m
t = 12s
a = ?
vi = ?
Calculamos aceleración:
a = (vf - vi)/t
a = (4 m/s - 0 m/s)/12s
a = (4 m/s)/12s
a = 0,33 m/s²
La aceleración es 0,33 m/s²
Calculamos la velocidad.
vi = vf - at
vi = 4 m/s - (0,33 m/s²) (12s)
vi = 4 m/s - 3,96 m/s²
vi = 0,04 m/s
La velocidad es 0,04 m/s