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vi = 2 m/s
vf = 12 m/s
d = 28 m
a = ?
Calculamos la aceleración.
vf² = vi² + 2ad
(12 m/s)² = (2 m/s)² + 2 (28 m) (a)
144 m/s = 4 m/s + 56 m/s² (a)
144 m/s = 60 m/s² (a)
(144 m/s) / (60 m/s²) = a
2,4 m/s² = a
La aceleración es 2,4 m/s²