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if a car accelerates from rest at a constant 5.5 m/s^2, how long will it take for the car to reach a velocity of 28 m/s

physics(Quick!) 
Millie,
vo= 0
a=5.5m/s^2
v= 28 m/s
t=?
v=vo+at
at=vvo
t=(vvo)/a
t=28/5.5
t=5.09 seconds