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Los datos que tienes son:
vi = 0 m/s
a = 9,8 m/s²
vf = 100 km/h
t = ?
Convertimos las unidades al SI
vf = (100 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 27,78 m/s
Calculamos el tiempo
t = (vf - vi)/a
t = (27,78 m/s - 0 m/s)/9,8 m/s²
t = (27,78 m/s)/9,8 m/s²
t = 2,83 s-----------------Respuesta