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Sacamos los datos del ejercicio:
d = 100 m
vi = 5 m/s
vf = 20 m/s
a = ?
Calculamos la aceleración
vf² = vi² + 2ad
(20 m/s)² = (5 m/s)² + 2 (100 m) (a)
400 m²/s² = 25 m²/s² + 200 m (a)
400 m²/s² - 25 m²/s² = 200 m (a)
375 m²/s² = 200 m (a)
(375 m²/s²) / (200 m) = a
1,88 m/s² = a
Respuesta.
a = 1,88 m/s²