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v2=212km/h
v₀=212-140=72km/h=20m/s
t=2s
a=v₀/t
a=20\2=10m/s²
a=v2-v1/t
212km/h=58,888888888888888888...9
140km/h=28,888888888888888888...9
a=58,88...9-38,88...9/2
a=20/2
a=10 m/s(2)