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Vo = 90 km/h (1000m/1km) (1h/3600seg) = 25 m/s
Vf = 0 m/s ----> Se detiene
T = 5 seg
D = ?
A = ?
Se calcula la aceleración
A = Vf - Vo / T
A = 0 m/s - 25 m/s / 5 seg
A = -5 m/s²
← ← ← ← ← Va en contra del movimiento por eso negativa
D = Vo * T - A * T² / 2
D = 25 m/s * 5 seg - 5m/s² * (5seg)² / 2
D = 125 m - 2,5 m/s² * 25 seg²
D = 125 m - 62,5 m
D = 62,5 m -----> Solución B)
Saludos desde Venezuela