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Los datos que tienes son:
d = 50 km
vi = 5 m/s
t = 25 min
vf = ?
Pasas las unidades al SI
1 km = 1000 metros
50 * 1000 = 50 000 metros
1 minuto = 60 segundos
60 * 25 = 1500 segundos
Calculamos la aceleración
d = vi.t + 1/2 at²
50 000 m = 5 m/s (1500s) + 1/2 (1500s)² (a)
50 000 m = 7500 m + 1/2 (2250000s²) (a)
50 000 m - 7500 m = 1125000 s² (a)
42500 m = 1125000 s² (a)
(42500 m) / (1125000 s²) (a)
0,04 m/s² = a
Calculamos la velocidad final
vf = vi + at
vf = 5 m/s + (0,04 m/s²) (1500s)
vf = 5 m/s + 60 m/s
vf = 65 m/s------------Respuesta