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Los datos que tienes son:
vi = 0 m/s
vf = 15 m/s
t = 2 s
a = ?
Calculamos la aceleración.
a = (vf - vi)/t
a = (15 m/s - 0 m/s)/2s
a = (15 m/s)/2s
a = 7,5 m/s²
Respuesta.
a = 7,5 m/s²
15= 0 + a.2
15/2 = a
7,5 m/s² = a