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Los datos que tienes son:
vi = 0 m/s
d = 0,20 km
t = 1/3 min
a = ?
Convertimos las unidades al SI
1 km = 1000 metros
1000 * 0,20 = 200 metros
1 minuto = 60 segundos
1/3 de 60
(1 * 60)/3
60/3
20 segundos
Calculamos la aceleración
d = vi.t + 1/2 at²
d = 1/2 at²
200 m = 1/2 (20s)² (a)
200 m = 1/2 (400s²) (a)
200 m = 200s² (a)
(200 m)/ (200s²) = a
1 m/s² = a
Respuesta.
a = 1 m/s²