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Los datos que nos dan son:
a = 4 m/s²
vf = 180 km/h
t = 10 s
vi = ?
Pasas las unidades al SI
vf = (180 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 50 m/s
Calculamos la rapidez inicial.
vi = vf - at
vi = 50 m/s - (4 m/s²) (10s)
vi = 50 m/s - 40 m/s
vi = 10 m/s
Respuesta.
vi = 10 m/s