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vi = 0 m/s
vf = 40 km/h
t = 4 s
a = ?
Pasas las unidades al SI
vf = (40 km/h) (1000 m) / (1 km) (1 h) / (3600 s) = 11,11 m/s
Calculamos aceleración.
a = (vf - vi)/t
a = (11,11 m/s - 0 m/s) / 4s
a = (11,11 m/s)/4s
a = 2,78 m/s²