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

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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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