Physics
posted by Tonya .
If your car accelerates from rest at a steady rate of 4 m/s2, how soon will it reach 84 km/h

Physics 
Henry
V = 81km/h = 81000m/3600s = 22.5 m/s.
V = Vo + at = 22.5 m/s.
0 + 4*t = 22.5
t = 5.625 s.
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