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acceleration=changevelocity/time
from time 0 to 1
a= (2/1)=2m/s^2
from time 1 to 2
a= (2/1)=2m/s^2
from time 2 to 4
a= (4/2)=2m/s^2
from time 0 to time 4
a= 8/4=2m/s^2