Posted by Ronnie on Wednesday, February 27, 2013 at 9:00pm.
First you need to convert the final speed to meters per second. I assume you know how to do that.
Vfinal = 120 km/h = 33.33 m/s
The acceleration rate is a = 3.5 m/s^2
Time required = Vfinal/a = 33.33/3.5
= 9.5 seconds.
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