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vo= 72km/h= 20m/s
t= 10s
vf= 10km/h = 2.78m/s (aproximado)
a= vf-vo/t
a= 2.78m/s - 20m/s ÷ 10s
a= -17.22m/s ÷ 10s
a= -1.722m/s2