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Los datos que tienes son.
vi = 0 m/s
a = 4 m/s²
d = 100 m
vf = ?
Calculamos la velocidad final
vf² = vi² + 2ad
vf² = 2ad
vf² = 2 (4 m/s²) (100 m)
vf² = 2 (400 m²/s²)
vf² = 800 m²/s²
vf = √800 m²/s²
vf = 28,28 m/s---------------Respuesta